I think I'm beginning to suffer a little bit of healer burnout. Curiously, it's not because of Blackwing Lair or the high-end raiding, it's because of ZG.
My guild does casual ZG runs, and I've been on several of them. Lately though, I've begun to not want to go on these runs, even though ZG is probably my favourite raid instance. The problem is that we now outgear ZG--basically just running it for fun, reputation, and profit--and so people are slacking off.
And when other people slack off, the healers have to step up and pay even more attention. And this is kind of annoying. It seems excessive that I have to be in full raid healing gear, or spamming Holy Light, for a ZG run. But it's nuts, people pulling aggro, mages suicide AoE'ing*, not bothering with crowd control, etc. And because we do outgear ZG, and the healers step up, we survive this silliness.
Personally, I find efficient runs to be more fun. Crowd control, tank properly, and focus fire. Killing swiftly and efficiently. Minimize the amount of healing, and the number of people to be healed. Take care of the little things, like making sure the bat boss is tanked far enough away from the raid so that the casters aren't hit with the AoE Silence.
As an example, take the Bloodlord fight. My guild likes killing the raptor first, and then healing the tank through the Bloodlord's Enrage. This strategy, while it does work, is hell on the healers. Yay for an enraged Bloodlord running around 2-shotting people! I find having a couple off-tanks ping-pong the Raptor between them while the rest of the raid kills Bloodlord to be so much easier and less stressful. But because the previous strategy is simple, and we have the gear and healing power to do it, it's what we do.
I've really begun preferring the harder raids. Maybe ZG is easier, and we wipe more with higher repair bills, but people are trying their best, and not making the raid harder than it needs to be.
The worst part about it is that I know that the people in the raid are better than this. That if they actually cared about having an efficient run, we could go through ZG like a hot knife through butter.
* Honestly, if you died the first three times, maybe that's a sign that this is not a good tactic.