(late replies, yay)

I use Vim, a pretty old and complicated text editor that's quite different from the way you edit in most other text editors, though you can be really fast and efficient with it once you learn how to use it.

Vim uses several different 'modes' when editing text -- by default you're in normal mode where you can enter commands to change the text or move around, like h/j/k/l to move left/down/up/right in the text, i to insert some text o to create a new line. When using a command that inserts text you'll go to insert mode, where the keyboard acts mostly like a regular text editor, and when you're done you can go back to normal mnode to quickly move around in the file, or repeat yor last action, or record a macro to speed up some repetitive task, etc.

Vim is really flexible and can basically be configured to do whatever kind of text editing you want, be it nice support for your favorite programming language, even more commands to jump around in your files or maybe even playing Tetris.

I think this video of a plugin for controlling Vim with your voice is a good example of just how detailed and powerful the different commands in Vim can be (though of course normally you'd be typing a few letters on the keyboard and not talking to it )