i dont like addons that much. but gotta say, some are really useful, at least in my experience with wow. for me at least heal its more fun with a healbot. but i can survive with out it.
i think if they put addons on the game, you have the choice to use them or not. so its really a matter of who is playing not if there is addons or not. i would like to have the choice though.
also, gotta say that im totaly agreed with @zeroneutral on ^ that.