Actually, as a rebuttal, I've tried both clicking and full keyboard methods in WoW, and I've been immensely more successful as a clicker. This is a personal thing, of course. A new player who has no idea what their abilities do or where they are is going to take a long time with a mouse, searching for the abilities. As a practiced player, I never had any issues keeping up with keyboard players. Furthermore, the mouse has become a very viable option due to the addition of add-ons that allow you to move your abilities across the screen and the wide-spread use of gaming mouses like the Naga, which have the extra buttons. I use the keyboard with my right hand for movement, targeting, and push-to-talk, but my mouse is my number one tool when it comes to WoW.
