I use Drafts for a lot of things, but one of the most useful is just as an electronic scratchpad.
Whenever I need someone’s name or contact information, I just fire up Drafts and hand them my phone. The mostly blank screen, blinking cursor and keyboard make it obvious what they should do, and then I know where I can find the information, whatever I intend to do with it.
When I need to jot something down myself, I don’t spend time thinking about where to put it (Notes? Reminders? Contacts? Calendar?). I just use Drafts – then I worry what to do with it when I have a moment. Appointments I can usually just send to Fantastical. Contacts I can send to Interact (though I used to use a clunky script I wrote myself that didn’t work as well).
Most of the time, in my case, everything else ends up in my notes file. That’s just a Dropbox folder where I stick everything I might need later, as individual text files. I have Drafts actions that turns the first line into a filename, and the second line into tags that go into the body of the note.