Yeah, I guess it's different definitions.
If you're looking just at isolated Luffy for example, it takes him endless chapters to go from point A to point B. We hyperfocus on these things so people say "the pace is bad".
That's not the pace though, in those chapters that it takes Luffy to get from point A to point B, you have packed action and focus on many other characters which are all in motion. Pace is very fast.
It's about you not caring about Scabbards or Minks for example that's the issue. The core of the problem is writing of certain side characters that got a lot of attention (not all).
But I have said many times that I do care about the Scabbards and the problem I have with Wano is how Oda treats these characters. That is one of the reasons why I hate it. Denjiro has been missing for over a year. Ashura, who is he again? Kamawatzu hasn't done anything. Kinemon being a prevalent character for almost a decade has been treated like crap where now he is reduced down to making fart noises again.
And for pacing, my definition is, "the rate in which the story progresses and if those story lines have benefits to the actual plot". There is a reason why Oda had to apologize about WCI being so long because "he kept adding new and new ideas", that is an example of bad pacing that Oda essentially admitted to.
You what, that's the worst OP chapter
Nah, I think Fishman Island gets way too much unncessary hate lol. Yes, I agree Hody Jones was terrible but the amount of lore given to the readers in that arc was the most in any arc outside Sabaody. Also, the character interactions between Nami and Jinbei was handled great. The backstory of racism treatment of Fishman and Celestial Dragon were great.