I'd wager you'll find that's the case with anything you're an expert in.
Some topics (like QM) more so than others, because they have a certain coolness factor for the uninitiated.
For me it's Aerodynamics. So much so that my first year lecture includes an implicit warning in the induction lecture.
There's a massive catch22 with YouTube: (a) there's a lot of good stuff, and a lot of bad stuff. (b) In order to distinguish between the two, you need to be an expert. So what do you do if you want to use YouTube to learn something new and haven't at least got a good background in balony detection?