The bloat can be annoying and having a MMO mouse does not work for everyone. I purchased a MMO mouse thinking it would be a godsend, but because of the way I hold a mouse it gives me no advantage. I am one of those oddballs that grips a mouse with his thumb and pinky so I now have an overkill on thumb buttons.
The problem isn't the rotation. It's the rotation plus offensive cooldowns, plus defensive cooldowns, pluse buffs, plus debuffs, yada yada yada. For instance the toon I am leveling right now has @25 different abilities that are used on a regular basis in pvp. It's a good thing I have long fingers.....lol