No... I played WoW for 3 years and I never thought it took faster reflexes than FPS. You don't need any sort of aim. Once you have the person targeted it's just clicking a spell once every few seconds... The only time you need to be quick is if you are trying to keep a rogue from getting behind you.
Believe me..Nothing more then vsing three warriors on you while your a spriest..
Or taking down three mages while being a hunter or rogue..Good times..
Pve, that doesn't take much reflexes but it's so boring to me.