After trying G+ out for a bit, I decided that I just didn't need it. A lot of my less technical friends & family use FB. I don't care much for it, but I've come to regard it as an inherently privacy-free unsafe/insecure zone and treat it accordingly. I stay logged out of it when I'm not using it and keep it out of my usual online activities.
G+ blurred the line too much between regular browsing, search, gmail, my RSS reader, and all these "circles" of FB/Twitter-like social interaction. It just felt like it would be too easy to make a mistake and say the wrong thing in the wrong context, or find that I was sharing in a way I didn't want to. And that's assuming the service works as intended without flaws, without FB-style policy changes.
I've come to realize that fragmented, disconnected identities on separate websites is a feature. Yes, the dots can be connected by someone with significant resources. But why should I make these connections easy to make, or searchable? Doesn't do anything for me.