Like most of you guys, except Mimoo, I use nourish guite much. Having lifebloom (3x) and rejuvenation on your main target, nourish is kinda all you need for keeping it up. Even druing hard fights. Combine that with effloressence/swiftmed etc, and you can take a cup of coffee aswell
I feel healing touch is more like a emergency healing (during really hard fights). But then again, then you`ll probably use treeform.
All in all, using healing touch instead of nourish at all times will most likely result in a waste of mana. For some reason that is often the case when I see other druids heal either normal, HC`s or in raids. I have a feeling those druids thinks like Mimoo, who NEVER uses nourish, but healing touch instead, hehe. Way to go :P Personally I can say, there is no excuse for a resto druid (what so ever reason) to go OOM.
Have a good 2011, peace