If you are on a pc, just press the ''home'' button, automatically takes you to the top. And I am not talking about the windows key, but the one it stands ''home on''. Don't need a button for it when we already have one...
And if you are on a mobile device just do a quick short swipe up and you are at the top, going all the way down to find the button at the bottom and pressing it would usually be more work...