My hands always type them. But the HTML standard says browsers are required to display multiple repeated ordinary space characters as if they were exactly one ordinary space character. So you never see them. You can force the visible double-spacing behavior by using space characters other than the basic one, but that’s a lot of extra keystrokes, like 10 or 12, for rather little result. And is very unlikely to become muscle memory. Unlike the double-tap of the spacebar that I’ve now stroked five times in this post. 