If there's one thing absolutely guaranteed to get a gazillion comments on HN, it's a post about either 1) note taking software, 2) note taking methodology 3) a combination of the two.
I'm kinda fascinated by this, in large part because I'm sucked in by it too. I can't count the number of apps I've tried, or the dopamine rush when installing a new one.
What's this about? Do we all secretly believe we can be truly better people if we can just get this right? Or are we just endlessly curious about what everyone else does? Tell me, I need to understand myself better!
In the mean time the note taking apps help with:
Working memory - a page can hold far more information than I can retain in my working memory. Having a bunch of information helps me build a working model without having to retain all the information while I'm building. Spot patterns - by organising information it's easier to spot patterns.
Long term memory - your brain just isn't very good at retaining information long term. Maybe you have a company wide wiki but the act of building your own notes is enough to form some connections in your brain so that when you come back you have far greater familiarity and insight associated with the information.