I've no issues with healing GNB. I find them very sturdy. I've also been guilty of accidentally pressing Superbolide a few times. A macro would be nice, but I generally reserve a cooldown in case Superbolide pops without warning because I've been on both sides. It's nothing to panic over; I just deal and move on.

The only Tank button I'm not too pleased with is Living Dead, especially when a DRK uses it at 25% HP or so. I'm like "why?" Now I have to burn all my resources to get you to not be dead in 10 secs. But those instances are few and far between.