I dunno. I've leveled up every single class to at least 81, and Sage feels to have more button/task variety to me than, say, Paladin, Warrior, Bard or Red Mage. Especially when I'm applying Barriers to anyone I expect to take damage, not just the Tanks.
I do agree with the other Healers, though. Astro is my 2nd favorite healer, but drawing cards and playing cards happens too infrequently to remain fully engaging.
