Hopefully DRKs realise that it's not a good idea to pop it in a dungeon... In a raid though there are two healers and healing ~12k within 3 GCD isn't a big challenge. 3 Cures or equivalent do about 7-8k alone and using Cure II/Ben II does even more. All healers have some instant heals, hots are rolling and at least one out of 2 healers likely has Swiftcast available. It's not as bad as people make it seem imo.