This is why I said earlier that based on Vamp's posting history, he's unlikely to apologize to anyone for "misunderstanding" what's been said on the forums.
Given that there are several comments about healing on this very thread that are wrong, and many of them favorited several times, I think he is dead on about the general attitude towards healing.
If multiple characters have gotten banged up, a channel will heal 5d6 (avg 17hp). while this isn't a very big chunk of hp at 10th level, if you hit everyone in the party, and a summoned creature, mount, familiar, etc. It could likely be almost 100hp of healing.
Considering that neither of these options uses any substantial resources, or requires any special feats, equipment, build (other then healing domain), I would say that healing is VERY effective!"