I have no idea if people can tell when you move them in and out of and around various circles. If so, know that I am still fiddling around with this, so if you've been in and out of "friends" a couple of times, it's not a judgment call.
Also, an observation: the transition to G+ is like going on to junior high school from elementary school. Still making the effort to hang with elementary school contacts (Facebook) but also trying to move on. But it won't be a total move-on either, as I'll still hang with some parts of FB Awkward. Going to take a while to get used to.