I also have paper and pen with me all the time. A lot of people are trying to convince me to go digital—including my son—but I have yet to be convinced that there is a way to improve my workflow. Which is this:
take notes and sketches making use of however much paper is available and being creative in size, positioning and alignment of text. Quickly.
Clearly this doesn’t digitize well. It will be ugly, hard to read and lack all the context that you have in your mind at that time. After all it is adding to your memory not replacing it.
So the obvious and necessary next step is to convert these notes into actually useful longer-term representations like diagrams, summaries, tasks in a task tracker, calendar entries,...
I wrote a related comment in Paper Trauma:
https://www.lesswrong.com/posts/GpDjJFeCQCLjpt68b/paper-trauma?commentId=CDCDmAtyhMJNNgqg2#CDCDmAtyhMJNNgqg2