Draught is infinitely better on ONE target, yes, but that is basically the end boss only.
Orbit Breaker does pretty good damage throughout the run and all you have to do is take Twin Moons for it.
Granted, I don't do 3 hour Torghast runs killing mobs one by one.
I usually pull pretty big and kite and dot everything up. This can easily be done solo (I'm 153 on my druid) and yields a much better experience.
Out of all the dogshit powers a Balance druid can get during a run, Orbit Breaker is not one of them.