"It's like cata, without the mana starvation". This I think is an accurate statement. I do think our heals are weaker than in Cata though. I mean, I have healing spells that joyfully tells me that they heal less than 1% of a tank's hpbar per cast. I reply to those spells that they are dead to me and that I do not want to see them.
So, I'm a holypriest.
As a dungeon healer, healing is pretty much limited to "flash heal on tank until the fight is over". This barely - and I mean BARELY - keeps the tank alive when not overgearing things. Sure, you interweave a few other things to conserve mana, but that's essentially what healing is right now. Spam one button. At least it's a more interesting button than the Cataclysm "weak slow-ass healing spell".
As a heroic healer, life is pretty much the same. The difference is that tanks are better geared, and that means less healing is needed, and that means you can maybe throw a different heal every 5-6 flash heals. Ironically, I've had far less stress healing heroics than dungeons as a result. Maybe I just got lucky with my tanks. But I think the normal dungeons were a bit overtuned in terms of damage output.
As a raidhealer (LFR Molten core), life is far more interesting. Mana is tight. Maybe that's just because Molten Core loves throwing debuffs doubling the cost of your spells at you. But I oom'ed very fast, very hard. Prayer of Healing is almost unfeasible to use. Too expensive. It's renew or bust. It's just that renew is not really moving healthbars. Tanks have 300-450k hp these days. Renew heals for 2.5k-3k / tick. That's less than 1% per tick. Renew is filler at best. You need flash heal to get anywhere. And you can't really sustain that for long.
So yeah... in my 8 years of healing, I have never really felt weak as a holypriest. Until now. And I do realize that I don't have it too bad.
I do like having more mana though: It's far more fun when you have plenty of (but not limitless) mana.