I miss the healing spells, it's one of my biggest irritations of the game actually.
Taking healing spells out hasn't achieved anything, because all they've done is switch it for barrier. So what's the point?
Barrier is no more tactical than healing....because all the tactical decisions about who to use the barrier for and when etc is exactly the same as using your heal with the cool down.
But my biggest annoyance with it is the game world/story breaking quality of it. It changes the lore/history/world, and that sucks in a game where they have such fantastic lore/history/detail through different games. So....basically....one minute in Thedas, Mages are able to heal, and the next, nope, they can't heal anymore....accept for, wait, they can because it's talked about in cut scenes? What? It's like a book trilogy deciding that a certain magic that's been used by characters all they way through books one and two suddenly don't exist anymore in book three, and with no explanation...in terms of story writing, that's just lazy.
From what I read, it's actually the first two games that break lore. I say this because spirit healers are supposedly extremely rare, yet you have two for two (three if you count Anders in awakening). Also healing is supposed to be exhausting and intricate, like surgery. Again I point to Anders's recruitment scene when he's healing the young boy. I think he just fell off a wagon or something, sustaining injuries that one might have on a battlefield, and yet look how it wore him out. Now compare that with just having a 30 second cool down, and the gameplay/lore segregation takes a major hit (not saying they meet to be integrated at all times).
Now the fact isn't that healing has been removed, it's that they made it harder to do. The only heal spell missing from the game is a single target burst heal. Everything else has been folded into other spells. Rejuvenation is an upgrade in the barrier tree, you have revive and lifeward, and group heal, mass revive and mass rejuvenation and mass regeneration (the last two being new effects) are all on one (1!) Spell in the knight enchanter tree, only locked behind a focus. So it's all there, you just have to build up to it.