yup myself and my bro click (Anakyn) old school, dont like keybinds, like freaky said
you can watch those videos to see how i do it
I used to play with a pretty good warrior in WoW who clicked.
That said, he would have been really really good had he played with keys. :x
TL;DR you can get by with clicking, but you get so much efficient when you keybind.