I feel this all stems from 2 things really, the abundance of interupts + stuns + general cc (combined with the fact they all go full duration now), and the fact that Dps'ers dont have crappy gear anymore. Maybe I'm alone here, but whenever I see a warrior and a mage on the other side, I cry a little. I cannot cast a single spell, cause it will either be interupted, or the warrior will stun me in one way or another, so my healing i basically down to holy shock and WoG, which sadly cannot heal people through a 1v1 fight, never mind 2. The not casting is not just for that combo, I get very little casted spells off against anyone anymore.
So perhaps blizzard has changed its healing model. Healers should no longer be able to keep up a group 3v3 until their mana runs out. Im not even sure we can do it 2v2. So my new BG strat is to try to kite as many dps as possible. I find that if I can kite/take beatings for 10 seconds, then assuming even numbers, one of them usualy dies ;D