I'm still a fan of my shammy healer, because it makes me happier than the other healing classes. Not too squishy, decent mobility, good collection of buffs through totems and generally low maintenance.

Ankh is always useful, but don't DKs get a battle rez now? Running 4 DKs, that should trump Ankh. Still useful, of course, but wipe prevention is always better than recovery.

Last I played, I didn't even use chain heal. It was nerfed to shit, and I found far better use out of Healing Rains or throwing a few healing surges or riptides about if needed.

As far as tremor, I don't think I really used it that often in Cata dungeons. But the new Spirit Link totem could be really nice.