I just type
note (maybe some text here)
and it cracks open Emacs on the notes file, adds a timestamp, appends the optional text, and then I can just type or paste something in. Nearly frictionless, that's key. Great for writing those miserable annual reviews, too (easy answers to "what have I worked on in the past year?")I use plain old notebooks (simple blank sketchpads, or something bound like a Moleskin/Lecchturm) for meetings, interviews, walking around datacenters and so forth where a keyboard is awkward and anyway, drawings.
I've tried the EverNote/OneNote/etc. apps and none of them were as convenient or as easy to use, or as portable.