As a tank I dont chap the healers ass for wipes unless you can blatantly tell they are letting you die without reason.
It's stressful for everyone. Tanks and Healers require awareness and coordination. DPS worry about CC and damage. Now this is me personally. Do some pvp as a healer. Study damage intake and how much healing you can put out to survive. Do this a couple of times.
I havent been a healer in years. On my tanks though I will usually switch to my tanking spec and enter BG's to see how long I can survive in certain situations so that in dungeons I can imitate some of what I studied.