In 24 man I will tend to keep Medica 2 going most of the time. There is of course some over healing, but I found having that regen up means I don't have to babysit folks. It can also buy time if folks do something stupid. I keep a regen on the tank regardless of which group he is in.

After that I i mostly heal with oGCDs when I can. When there are the periods of heavy raid wide damage I will make sure that Medica 2 is up, then AoE heal to get folks out of danger and let the regen finish them up. I try and dps as much as I can but if the other healer is a bit more aggressive with their dps, I will usually crack first and heal . What I have found is even those healers more committed to dps than me will always insta cast rez so it all works out.

I have had some bad co-healers though. Like on the last boss on the current 24 man, the phase with heavy AOE dmg where we all stack up. I have seen a few healers casting cure 2 during that phase .

The only time having a bad healer is really an issue is the doom phase on the one 24man boss where we fight in the ring around it? That can be a bit stressful trying to get everyone healed back up in time and getting the tank topped off if I don't have any instants available...

I do agree with what folks have said. You really don't know what they other healer is doing if you aren't seeing fight statistics. I haven't often though one of the healers wasn't doing much but when I check I find out they were doing just fine, they were probably just managing their oGCD heals better than I was .