I have 4 of them with a Shaman healer, and have only used the heal as a self heal for a defensive cooldown, that was also tied in with exhilaration.
If I had 5 though with no true healer this would definitely be a nice option to have.
I realize I'm not answering your question but I always questioned myself on picking this race for my hunters and it makes sense that's a huge benefit if there is no healer around.
Thought for sure the Lightforge had a sweet heal too, but they do not.