I don't have any statistic, but I use them all the time. Under vim's default configuration, manpages are a single keypress away. If you press "K", vim opens a

I don't have any statistic, but I use them all the time. Under vim's default configuration, manpages are a single keypress away. If you press "K", vim opens a window with the manpage of the word under the cursor. It happens instantaneously, and it uses the same font and color scheme than your code. I would really hate it if it opened a browser!