Normally i too heal as elemental in heroics, most of the time im just too bored to heal when the highest dps is topping 2.5k... thats where my patience ends.
I can't really say I've had any complaints, but a few ppl asking "wtf whos healing?" I for one can't understand why the complain... the trash only takes half the time and i cut off 20 secs off the bosses, every few heroics i get another for free.