I know I did that for the anatomy class. I drew along the video and took some notes on certain things like muscle names, attachement points and a few other things. For me, being active like that while learning was more helpful than just watching lessons passively. And I did refer to those notes I took quite a lot actually, so it definitely was not pointless to do.
At the end of the day, the goal is to help you learn and get better, so if taking notes helps you with learning and retaining information, then I'd say go for it!
Also since this is Artschool related I moved this topic to the Artschool section. And I think that you'll also get more replies this way (hopefully)