I see a lot of people in this thread that have never actually healed at a competitive level. Taking the time to actually click the person is a loss in time overall, resulting in you wasting GCDs over the fight, being able to just mouse over the person and cast immediately is not a 'crutch' it's about optimizing your play. Clicking each player is slow and unnecessary, it's not a case of complex vs simple, it's a case of optimizing your play so that you can do everything needed in the time you're given. The people who are trying to spout that this would make the game too 'easy' have obviously never actually healed any Higher level progression based raids at a competitive setting in any game, where missing just one global cooldown over the course of 30 seconds can and will cause your raid to wipe.