What. I gave up on reading One Piece (and D Gray Man lol) because these Mangas are way to overloaded with text (good for the anime pacing, yes) or are too confusing because you can't make out which character is which (D Gray Man). I don't know. Naruto/To Love-Ru Darkness have the perfect chapter pacing for me.
The only time I've had trouble reading One Piece is when it's a dodgy translation and I have to work out what is actually being said.
On print it's even easier.