Google is testing another form of their back to top button from early this month. The new version doesn't follow you as you scroll or is in a bold blue color, instead it is a button added the footer of the search results page.
This is a lot less intrusive and seems more user friendly and less annoying.
Here is the screen shot from Sergey Alakov as posted on Twitter:
Here is the old blue hover test:
I like the new test, not the old one with the blue.
Forum discussion at Twitter.