Holmgang is fine as an emergency cooldown and I never saw a WAR using it as a planned CD for big pulls (contrary to DRKs with Living Dead). It makes a huge difference if I just need to keep the tank alive or have to heal 120k+ in 10 seconds.
Printable View
You have no obligation to bring the warrior back up to full though, just give him enough padding, which can usually be accomplished with a couple of skills (and never mind having all the time in the world to do so). The same can't be said with LD.
Also, there's the case of using it against multiple busters, like titania fae light or tethers where you can't actually heal the DRK right away. It's always a tight fit (even if you do some of the healing upfront) and it'll require a lot of resources. Often times just sharing + cooldown is less of pain to handle as a healer. Kind of sad really seeing as none of the other invulns suffer from this.
I had a DRK use do all six tethers on Titania Extreme by themself. They used cooldowns for the first 4 and went Zombie on the fifth. Living Dead is incredible when you look at what it's capable of but healing throught it without a WHM is a nightmare. I hate seeing it on my Scholar especially in dungeons. You blow every tool you have and still have to rez them and then have no tools to heal with while they have weakness.
Buff LD to 15-20 seconds plz.