I include in the the Usopp and Zoro focused episodes from the Post-Alabasta Arc. That's one of my absolute favorite chilled-out filler arcs. People have been highly rating G-8 since forever, but I'm a major fan of those little episodic snippets. I'd honestly love more filler that was a very small adventure, or not even an adventure but simply slice of life and mundane happenings for the crew. Though it's obviously not very chill (Straw-Hats fight a whole Marine base and run all around, but it's got a kinda low-stakes fun sense about) I really enjoyed the 3D short film "The Straw-Hat Chase" when I saw it for the first time recently, screened before Strong World.
–- Update From New Post Merge ---
@Jabra:
Oh boy, I could name a ton of things I would like to obliterate with an orbital canon. In fact I already theorized if I could eradicate entire arcs without hurting the overall story too much (and I will attempt it once the series is over).
But I don't really feel like writing myself into a rage right now, so I will just say what I would have wanted more of. And that is, without a shadow of a doubt, more breather chapters with intimate crew interactions. It doesn't have to be the whole crew, a focus on 2-3 at a time would have been fine.
If you have some time on your hands I would suggest watching 3 filler episodes of the anime in particular, I think they demonstrate perfectly what I've been missing in the last decade:
131. The First Patient! Anecdote of the Rumble Ball (this one is pure gold)
132. The Navigator's Mutiny! For an Unwavering Dream!
133. Inherited Recipe! Sanji the Curry Iron Chef!
Alternatively, the Shokugeki no Sanji spinoff is also a perfect example of what I'm talking about (not necessarily every chapter, but the general idea).
Sure one could argue that these sort of chapters should be relegated to the anime team or spinoffs, and I agree to some extent, but it wouldn't have hurt to be more generous in the manga as well.
I include in the the Usopp and Zoro focused episodes from the Post-Alabasta Arc. That's one of my absolute favorite chilled-out filler arcs. People have been highly rating G-8 since forever, but I'm a major fan of those little episodic snippets. I'd honestly love more filler that was a very small adventure, or not even an adventure but simply slice of life and mundane happenings for the crew. Though it's obviously not very chill (Straw-Hats fight a whole Marine base and run all around, but it's got a kinda low-stakes fun sense about) I really enjoyed the 3D short film "The Straw-Hat Chase" when I saw it for the first time recently, screened before Strong World.