PoM -> For DPS.
Cure 3 -> When you need a stronger version of Medica and there isn't enough time for Med 2 to tick before everyone goes splat. This is usually only useful for EX primals and raids for scripted back-to-back hard hitting AOEs.
Disable -> Works like Virus, used to mitigate either bursts of AOE damage or tank busters. Basically whenever you feel like it would cut off the most damage, that's when you use it.
Indomitability -> Healing-wise this is one of the biggest things you get as SCH @ 50+. Make sure to use this.
Broil -> Replacement for Ruin/Ruin II.
Deployment Tactics -> Stronger version of Succor, especially when you apply it to a WAR in Defiance - even better still if he has Convalescence up.
Emergency Tactics -> Basic AOE healing, will probably never need to use this but it's good in a pinch.
Dissipation -> Afaik, this is simply never worth using.

All that said, I don't play healers and only have anecdotal knowledge from healers I play with so take all that with a grain of salt. Hopefully at least some of it is correct, though.