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I fail to see the use for it, honestly.
For the lazy and slightly impatient basically. No need for scrolling if you want to navigate back to the top for a page change.
Here's a tip that I use regularly: hold down (don't press) your mouse wheel and move your cursor up. Release the wheel when you're at the top.
It's a good, lazy solution that requires even less effort than moving your mouse to a 'scroll to top' button and it works with any site.
I know that one, but thanks. I feel like the one click is faster as you have to drag the mouse further to increase the acceleration.