I can't imagine how I would spend very much time managing circles had I used Google+ more. The day I add somebody is the day I determine what circle(s) they would go into. For most people I know they would stay in those initial circles permanently. Moving contacts between, say, friends and work acquaintances would be pretty infrequent.
How do you imagine you would spend that much time managing them?
ML suggesting or guessing groups automatically would lessen the requirements of the user, but it was already pretty easy I thought.
