I haven't respecced any of my shammies to resto,
it works fine as it is now imo.

Sure I have some deaths on heroic trash,
that's mainly because either:
-I'm to lazy to start kiting... eehr.. trying to take it like a man
-I messed up a global cooldown and my stoneclaw fail to drop in between casts
-my cat wants attention and starts blocking my view/keys

Synchronised lesser healing waves work well enough for me,
there's never the problem that your healer got feared out of los, or is oom.