I don't like this one bit. I was on Youtube and noticed I was logged in. Then when I logged out on a "Video Sharing Site", I was logged out of my "E-Mail Program" that was open in another tab too. I was scared for a second that a public Youtube profile had been made from my gmail-address, so people can view my last log-ins. I also looked, to no avail, at a way to disconnect my personal Gmail-account from Youtube.

I will miss the personalization. But for me this too will mean less browsing while logged into Google services. It is not the same scale like Spotify requiring a Facebook account, but it is close enough to make me cringe and worry about my favorite online services.