It is imperative in certain editors that you fumble for the mouse whilst in vi one can simply declare 3ff to get to the third f on the line. Granted, I mostly do not use certain editors, and accidentally compiled mouse click support out of the terminal—brushing the trackpad risked spamming programs with mouse noise, and some programs would sometimes do silly things with it. The mouse is fine for focusing terminals, I guess. (No, not vim, vi.)