Also love the act of writing things on paper. It's very convenient to have a sharable document, of course. But doing the motions, writing slower, just handling the paperspace, all of these combine to make ideation so much more productive.
I switched to paper notes a few RPG campaigns ago and it's just so nice. The freedom to introduce spatial relations to concepts is just neat. But also, since I'm usually running the games online, not having them take up screenspace is yet another boon.