Tier A: Lucid Dreaming, Swiftcast, Eye for an Eye
These should be on all healers all the time. LD is for MP regen, and Swiftcast for instant Raise. E4E is a damage reduction buff that can be applied throughout a fight by both healers, so both carrying it is helpful.

Tier B: Esuna, Largesse, Protect
Esuna and Protect are both useful, but are only needed by one of the healers. For this reason, players that want to plan out their skills with their co-healer can run without. For SCH, Largesse is basically a version of Dissipation that doesn't suck, which I find hilarious. But ultimately, for the same reason people dislike the concept of a pure healer, the added healing of Largesse is never necessary if you're on top of your healer game. Take it if you're ilevel is still low for the fight you're going into, and you feel like you're struggling to heal enough.

Tier C: Cleric Stance, Break, Surecast, Rescue
These are all too weak to warrant a spot on your cross role actions list. CS is now too weak and too short to make a good enough difference on a healer. Heavy was only useful for PvP, but since it has its own actions now, I cannot see any purpose to this unless we get more mechanics like A3S's add phase. Surecast's knockback immunity (assuming it will work on raid mechanics) will only be useful for the players who aren't properly handling mechanics. I suppose if your latency is pretty bad, you could take it as a safety net, but you shouldn't need this if you're doing the fight right. Rescue's a tool designed to try and fix your teammate's mistakes, but again, you shouldn't take this if you're following mechanics.