I do a very similar thing, but into a single text file using a simple bash script so writing to the file takes 1 keypress to start and 2 ENTERs to end. Then every week or 3 I sort the contents of that file into the appropriate chapter/section in the half dozen LaTeX books I'm writing. For decades I filled notebooks and never looked at them again. Now it's beautifully organized and easy to locate. I just wish I'd started doing this 30 years ago! Well, 30 years ago started a diary, which I kept going for 25+ years. But that's very different to notes on everything you think about, links, pictures, quotes, programs, things learnt, etc.