I've played as a healer on everything bar a Paladin, and I've just decided I'm now going to roll a Merc Bodyguard.
I started in TBC, and played a Resto Druid, for the most part, doing early heroics and so on I just used the standard blizzard UI to heal, then I discovered healbot and have been raiding with that ever since. So, whilst some elitists might frown on my point-and-click healing adventure, it was just so much easier than using the built in raid frames.
Now healing in TOR, I'm going to have to use raid frames, are they awkward to use? Especially coming from the nursery that is Healbot, I'm not a complete tool all the way and I catch on pretty quickly, but I just feel i'm going to be a lot slower reaction wise than I was with Healbot.