As much as I joke about never really improving at drawing, the thing that I really love about my daily-ish routine is those rare moments of "Oh, THAT'S how that works!"
I've always been really spatially challenged, so there's something really joyful about spotting the probably obvious.
It's all stuff that I've heard before, too. But I find that this is a really challenging domain to integrate didactic learning into (or even just to retain).
It's quite unlike any other domain to me; there's no satisfactory capture of a concept through words or data. I just have to experience it.