That's why I've largely unfollowed "famous people" on Google Plus... until they have the ability to view "everyone but X circle". The only people of the 100 or so I follow on Google Plus who post anything are celebrities and they post nonstop (and the hundreds of useless comments keep bumping their stuff to the top of my feed). It works on Twitter for some reason, but not on G+.
I've actually created a couple of composite circles that include the people from circles I want to pay attention to depending upon how much time/etc I have.
My biggest reason for not using G+ more (I prefer twitter) is that a single conversation / thread can take up too much room in the feed. I rarely have the time to wade through / scroll down constantly -- the composite circles tend to help a bit.
