Have you considered the possibility that you're just bad?

One of a few things is true here.

Either you're talking about AoE-damage-centric fights where CoH priests SHOULD be doing lots of healing, you're not properly taking into account roles (the tank healer is going to have less healing than the raid healer no matter what specs they are) or you just don't know how to play a disc priest.

Now, disc in a raid is going to under-perform compared to holy, even in the same gear, it's SUPPOSED TO, but if you're in Hyjal gear and getting out-healed by such a large margin by players in blues/greens on fights that aren't predominantly AoE damage... then, I'm sorry to say, but you just aren't very good.

Maybe, instead of QQing about how awful it is that you're so low on the healing meters (as if that, itself, even matters... roll a rogue if you want your e-peen stroked), you should go l2p.

I've raided as both IDS and CoH... and, yes, taking the "support" spec hurt my numbers and my "rank" on the healing meters... but nowhere near the level you describe, so either I'm phenomenally good (doubtful) or you need to work on your skills.

That said, *A* nerf and *THIS* nerf are two different animals. 2-3s cooldown? Okay, not terrible. 4-6s cooldown, but hits 8-10 targets? Fine. 4-6s cooldown but does 2-3x the healing per cast? Tolerable.

This particular nerf removes priests from AoE healing almost instantly. If your only viable AoE heal can only be cast once every 6 seconds and heals for such a low amount, you're basically worthless. Totally not worth a 41-point talent... 21 point, maybe, but not so far down the tree.