That's what I like about One Piece. You're well aware of everyone's strengths and weaknesses, but still there's no horrible Power Creep.
For example, DBZ Movie 3. There's enough croonies for everyone to fight, but Goku beats up all of them, hell even 5 bastards at the same time.
Okay, so maybe a DBZ movie isn't the best example, but it's pretty guilty of the Power Creep