Still, it bothers me when it says "logged in" in the google bar at the top because google watches my searches. When I am on facebook I behave like I am in public. I don't hope for the best and write secret stuff anywhere. But with all the google searches I make through a day, I am giving google a lot of very personal information that I would not like anyone to see. I would hate to see something that I was searching for somehow show up in a stream for my friends to see because I accidentally clicked a +1 button or similar.
I think you hit the nail on the head. I think Google+ looks pretty neat. It's more along the lines of what I am looking for in a social network than Facebook is. But I do not plan to use it for the exact reasons you mentioned.
My searches are private. Anything I do on a social network is public. I do not want the two of them mingling. I don't want the possibility of an accident. I don't want a single entity to "own" my search and social data.
I really wish someone else had created this.