If you'll notice, a lot of stuff there boils down to healers liking either a) being responsible for saving a raid, or b) doing something out of the ordinary. I think some part of the reason is that we get so little praise in general. When you down a boss, there's some crowing about DPS, maybe the tank talks about his cooldown usage or something, but very rarely is a compliment paid to the healers. I can count on one hand the number of times after a fight that someone has said "man, that was awesome healing." My claim to fame was solo healing a Kael'thas attempt. Granted, it was at 80, but we were also 8 manning it. The Disc Priest we had died almost instantly, leaving me to run around and manage everything in that giant room. It was fun, but having people afterward go "how did you keep up with damage 100y away from each other as a Shaman?" made it better.
So compliment your healers, but don't patronize them. When they do something right, then mention it.
Also, personally, I hate criticism. To be honest, I don't care what you were doing in a particular fight, you didn't get a better view of what I was doing than I did, and I can figure out what I did wrong. So if you happen to get into a group with me, be very careful how you tell me to do something else. :P
