With almost 3 million people agreeing I was not alone. (see the results number?)
I'm not sure how anyone could think that having that bar all over the sites, could make people happy. Yes, it uniformed their sites, but I do not want it in my browser thank you very much.
I tried to find out as much as possible about the results of leaving G+. I was so upset to learn that once in, it was like Hotel California.... "you can never leave".
It said at the time, that once in, if you deleted the account, you would lose ALL associated sites and services. Imagine my delight. My blog! My youtube channel... flickr, iGoogle, photo albums, Followers... etc etc etc. That was a scary thought, if only virtual in value.
I guess they were bombarded by many postings because they changed the settings from "no can do" into "we will attempt to set things the way they were" so I changed my email for the blog just in case. I had not changed my profile to the "new google profile" mostly because by then I was mad at google+, and that was a good thing, because it is more difficult when you have the accounts joined with it!
So basically, undo the joining of accounts, (like in youtube for example), change momentarily the email to your blog (a pain, I know, but it helps), then go to the Google Account Management, settings, and from there select either to delete just the plus, or the entire thing. In my case, it was just the G+, and only after I insured it was not going to drag my blog into the mix.
My "Profile widget" was gone until I removed the other new email, and I added my old one back, then everything went back to normal.
Now my browser is back to normal, with no black bar on top everywhere I go. I'm very happy. ٩(◠◡◠)۶ Maybe in the future they will do some new thing I'd like to use, at this point their social networking site did not feel private to me, was too repetitive, like when you get a FWD repeatedly and has all those little extra lines... ugh!
I recommend to try out any site, but with an email that you won't care if they get nuts on your account, just in case