I teach digital art and am also a painter. When I was a student I loved filling sketchbooks with drawings - like a collection of ideas. To a large degree my web bookmarks and screen grab library have taken over this function. That being said, if I want to quickly communicate visual ideas to students or craftsmen I much prefer a paper and pencil. It feels so much more nuanced, comfortable and expressive.

I've taught digital art classes too. I was pleasantly surprised at a writing assignment where most students (un-prompted) turned in a hand-written response.