#9 - Sept. 5, 2006, 1:33 a.m.
I've grown into a combination of the two when using my priest, although it's still generally based on keyboard use it's more mouse use than I had been using for past classes. I have my healing and offensive spells on different bars and use a shift+scroll wheel up/down to switch between them. When healing I click my target, shift+scroll down, heal (and select anyone else and heal),shift+scroll up, do any offensive abilities I may want to or can, etc. keeping some staples on both bars (wand, dispells, shield). It seems to be working out pretty well so far, at least while I level and am getting a lot of use out of both. I'll probably end up rearranging once I get into my high 50's though as I plan to go holy.
While for me using the keyboard is more efficient, I have seen plenty of people who through sheer practice can keep up by clicking. Whatever works for you.