Interesting you point that out, because I also used to feel that way. But as I started typing more notes, I realised that just the act of typing out my thoughts and putting them into prose goes a long way to understanding something [0].
Nowadays, if I don't understand something, I head to the keyboard and start explaing it in text and it pretty much always works. I rarely revisit notes, mostly to link them together and very seldomly to revise them. If I have the time to organize the notes, that's great, if not, that's fine too.
I don't know know if this will work for you though. Learning is highly personal and imo just trying to find new ways to learn things can help a lot too.