Actually, the artifact ability, Sheilun fills the void pretty nicely. It does have a cast time, but it hits like a truck when you have a full set of mists. The range on Essence Font is actually 25 yards, but yeah that is pretty limiting. Overall, I think the spec works nicely. Could maybe use a bit of utility, but it seems to be one of the more powerful healers, it just is different than on live today.
Your second artifacts become available at level 102 (this may change), so it wouldn't be too bad to do the DPS artifact quest to begin with, then hoard all the artifact power items till 102 when you can start applying them to the healing artifact.