I guess it is a little spooky, but not really. I know in other areas Google has done some pretty spooky and outright stupid stuff.
One thing I have always loved about them and continue to praise them for is their search results. More specifically the relevance of their results to me.
Most tricks they employ to make results more relevant I am for as long as it isn't recording things I have an expectation of privacy on. I don't think of my mouse over and mouse placement as something I would expect to be private.