Signing up via Google give me no creeps. The real annoying thing is that after you sign in with Google, when a website still wants you to "complete registration" by giving all the normal information you would have given at registration.

I guess for me, the reason why signing up via Google is not as creepy feeling inducing as Facebook is because Google gives you the option of putting on Google+ whether or not you sign in to a given website. The default is still to put it in your feed, but at least you can choose not to put it in your feed.