Even in Emacs, I use the mouse because pointing the insertion point or cursor or whatever to where I need to type next is *much* faster than many repetitions of a keypress a lot of the time. 

Sometimes I do only need to travel up or down one line at a time though, and then the mouse seems like a waste of time to grab, so I just ctrl-n or ctrl-p in Emacs to get there (yes I don't use arrows unless I have to, and no this didn't feel natural for a long time).

I suspect there's no perfect editor interface available.  All of them beat editing crap on my iPhone :-)

Dave