What do you do about ideas you think of when you're not at a computer? Or when you're at a computer that doesn't have access to the network you usually store notes on?
press a single key combination, of course! but in vim!
That's the best feature of vim, it works even when you're away from the computer!
I pull out my phone and use Beorg, which syncs with my Dropbox.
The next time I'm at my computer, the notes are right there in Emacs.