Healing is not boring at all, but that depends on what you like and on the group you are healing, of course.
And yes you can take your saber strikes off your hotbars. You will never, ever use them.
Nonsense! I use double-strike now and then - to gleefully finish off a tough marauder that's been on me during a wz
As the the OP - a hybrid healer spec is the most useful sage build atm - and it uses Egress and Bubblestun.