Of course, here you go.
The standard OP formula is applied to WCI. Many think that the escape story was something entirely new, but it really wasn't. Only on the surface it was something unique. The general formula was still the same:
1) Sail to new island - check
2) Meet the locals (oftentimes a young female as local hero) - met Pudding, who was first an opponent and later on a damsel (different clothing than usual, but idea stays the same)
3) Learn about the bad guys and problem of the good guys - confrontation with Sanji, where the big dilemma became obvious (different clothing, because this time the "good guy" was one of their own)
4) Meet the bad guys and fail - loss against the enraged army/imprisonment/loss at the tea party
5) backstory of the local hero and sometimes even villain - Sanji's/Pudding's/BM's backstories
6) re-match against bad guys again and win - escape at the last second/Luffy's win against Katakuri/Sanji "winning" with the cake (cake plot was a different clothing as a victory, but idea was the same)
7) banquet - party on the ship (smaller than usual, but we still got it)
Oda really only did minor changes to his usual formula.
Now we come to the pacing issues. I don't know why you thought that this would contradict with the points before.
The entire second half of WCI lasted for more than 30 chapters. Those were 30+ chapters of BM screaming "weeeeddiiiiiinnnngg caaaaakeeee" and Luffy vs Katakuri basically. Highlighted by some gross fake-tension moments in between (Sunny seemingly being destroyed, Pound "dying", BM's wave against the ship, BM on the ship herself etc.).
30 chapters were entire arcs pre-skip!
Just to put this into perspective: This completely pointless and ridiculous escape plot alone lasted way longer than the entire Drum Arc (24 chapters), Jaya Arc (18 chapters), Sabaody Arc (18 chapters), Impel Down Arc (25 chapters) and just as long as the entire Marineford Arc (31 chapters).
30+ chapters that only achieved these things: Luffy's questionable win against Katakuri, Sanji's cake healing BM, them escaping on the Sunny
It's borderline criminal pacing, if you think about it.
As for the PIS and plot-conveniences, I won't even start. There are simply way too many there to list them here. Den_Den and a few others have already named a few, but there are countless more.
1. That's not a formula it's... the entire plot. The main character's goal in life is to sail around the world. That's like pointing out "Naruto uses chakra" or "Spider-Man swings on webs" as part of a story formula. Aside from that we've seen them submerge to reach an island, fly to an Island, have an island fall on them, get sucked into an island, get hit so hard they sail across the sky to islands, and in this case get captured and taken to an island.
Which in this case was part of a different set up: Dressrosa concentrated on half of the main characters, and the rescue plot provided the story of exclusively focusing on the other half.
2. Pudding meeting was deliberate as she was a henchmen in disguise. That's nothing like Aisa, Konis, anyone in water seven, the giant kids, the Kozuki clan (minus Kanjuro), etc. She's not a damsel in that her change of heart is her own decision and she is not saved by the end of the story. Of the characters who might have the most in common Hancock's autonomy changes the character, Tashigi is selfless, Kanjuro has no redeeming qualities, and the princesses don't have conflicts of loyalty.
3. Luffy actually knows why the WG wants Robin and the dangers that would await her. He understood that she wanted to die. This goes back to the tomb, to Aokiji, the EL raid, and as recently as the Whale Forest. Luffy knew that Nami was stuck as Arlong's slave. Luffy understood Jinbe's delays in joining the crew. However, Luffy doesn't understand why Sanji's family doesn't like him. It was the motions of the betrayal arc for crewmates except Sanji's relationship with Luffy is different and the heart to heart they have is unlike what Franky, Robin, Nami, and Usopp had when being in the crew or not was the question.
4. Again, this series is about that. Pirates capture people. Not that this was the case for Luffy in the two preceding arcs.
6. There was no rematch victory against the boss. That singlehandedly makes this story different from everything except Marieneford and Impel Down, and I don't think we have to discuss why this arc is still very different from those. Sanji's victory was a niche in that it was... exactly what she wanted. You can say he won by being the best chef, you can say it was a victory by taunt... but you can't say it's what normally happens in any arc.
*8. You didn't actually count 30 chapters. Thirty chapters is the difference between the meeting with Bege and the conclusion of Katakuri's fight, or the space between Big Mom's fight with Capone and the Straw Hats leaving the territory. I was talking about something else when I mentioned a contradiction (WCI having the same formula but being somehow being a worse story... sounds like it's being called "the same but different" which makes no sense) but now there's a contradiction between what your complaint says, "t
hose were 30+ chapters of BM screaming 'weeeeddiiiiiinnnngg caaaaakeeee' and Luffy vs Katakuri basically" and what you actually see if you don't exaggerate the number of chapters those parts take up. What gets accomplished in 30 chapters then? The assassination plot gives way to destruction of the tower, Luffy gaining a complete upgrade and beating a billion berry man, the best and worse case scenarios demonstrating the upcoming Sulong, Jinbe demonstrating the importance of a helmsman, Sanji's crowning achievement as a chef and earning of his upgrade, Nami getting a power up, and Chopper and Brooke getting motivation to grow.
Pedro's arc brought his "out of time" full circle as he was encouraged by Roger... who ran out of time, himself. Coming full circle from his experience with Roger, he was the first one to not just recognize what Luffy means to the cycle but die for his belief in it. Katakuri (betting on Luffy's future in a different way) was a callback to the idea Oda used Chinjao to establish in ruling over CoC users. Escaping on the Sunny earned him the title of "fifth emperor" which I think is pretty important, idk. This reminds me of the endless complaints back in the day that Skypiea or Thriller Bark were filler because they "had no pay off."