I am not that concern about Google+ ability to track me and aggregate data, this is not new, we were already tracked before with every move we do on the internet. Install the Ghostery Chrome extension, it shows you the list of trackers on each page you visit, it's fascinating, this site for example seems to report every page visit to to Google Analytics.
My concern is that the Real Names trend that Facebook started and Google followed makes some of this aggregation public on 'my page' in conjunction with my real name. Teenagers like it and don't see any problem, I don't. That's why I stopped any contribution via Youtube comments, Android apps ratings and Google Local restaurant reviews. Amazon still allows anonymity and so is this and similar forums and this where I provide feedback.
As for the usability regression Dave complained about, well, that's life, sometimes changes are great (e.g. Android keyboard swipe) and sometimes not (e.g. Gmail New Compose), nobody is perfect, and these decisions are often made by a not that senior product manager.
The most important thing when dealing with free services like these one is to adapt. Things change and will keep changing. Some changes we like and some we don't. When Google recently killed iGoogle I switched to Draggo and like it even more. Who Moved My Cheese is a recommended reading.