I don't know, I've rarely died in 8-mans so I guess I've not run into any lazy healers. I do notice a tendency for high-dps healers to forget that Esuna existed, though...in 8 mans and in 4 mans. I sometimes feel this unspoken pressure of "you should've avoided that attack so it's your fault your casts will be canceled randomly for the next 30 seconds" while the healer (or both healers) keep on dealing their oh-so-important-mega-dps.