Well normally only the tank is tanking damage, so I'll be spamming 1 2 and 3, but since most fights I don't take as much damage as i did on Patchwerk, I rather conserve my priests mana by not overhealing too much. Especially by hitting 9 a few times in the middle of a fight to reapply prayer of mending, powerword shield and renew, or if I just want a quick bubble on the tank I'll hit Alt-3