Indeed, on Highkeep, it's not a question of what kind of healer is available. It's always, is there a healer available. More often than not, none is available so we hear alot of, "well, we have 2 pallys that will just have to do". I even had the great displeasure of raiding DFC with a 12 man group and at 40 being the only source of healing because the other pally left 10 minutes in. Not a happy case as we can bumble through main healing but don't stand a snowball's chance against an epicx2 like Lord Fyst.
This event more than anything is what encouraged me to work on my lv13 cleric....