Endgame healing with a Sage feels a bit like a combination of Holy Priest and Healing Druid from wow.
You'll mostly be using Shield, Rejuvenation (HoT) and Healing Trance (channeled heal), and ofcourse your aoe heal, which in many situations is enough combined with shielding
Those 2 heales you mentioned you won't use that much (rather not actually) later on, because they are too expensive in power to what you gain from it.
And the self heal that they added is awesome, it's free
i rarely have to use a heal on myself besides that self heal.
overall, i love healing on a sage and prefer it above dps (my main is a sage healer