I've actually kind of fell into the habit of using two browsers. One that I keep logged in to my Google account and one that I never log in with. If I want to do something "Googley" that I want tracked, like watch YouTube videos in my subscriptions or check my G+ page, I use the Google account browser (Firefox). If I'm just browsing my various forums and random links and videos and whatever I don't want associated with my Google persona, I use the non-Google account browser (Opera).

It ends up working pretty well, though I guess it is more hassle than it needs to be.