Think I'm a combination, a lot of my attacks are binded to keys, but an awful lot are also binded to mouse buttons (of which I have plenty) so I'm not sure that really counts as clicking.
tbh, some casters if you really dont have to move much in PVE I don't see anything wrong with clicking, but there are a lot of melee classes/specs which I can hardely imagaine anyone being clickers for with out being awful or dying lots.