I've had a Moleskine notebook in my bag for the past 4 years, it was just this year I started using it almost every day. TODO:s, quick calculations, poems, the start of a novel. The feeling of pen to paper is difficult to compare to anything else.
I enjoy writing on a good keyboard as well but it really is two different kinds of writing. Finding a good pen was difficult since I am prone to losing things and didn't want to spend astronaut money on something I would just misplace. I'm using a Muji 0.5mm black gel pen right now which really suits my needs.
The way the ink flows out when you keep the pen to the paper for a bit, how it shows where you took a moment to think. How thin strokes shows how you wrote something in a hurry. Black boxes throughout where I decided on a different word or spelling. Pen and paper shows the work and tells more of the story.