I would say that it wasn't watching the videos that was helpful, but more applying the concepts and techniques. I took general notes and reviewed them periodically (spaced repetition!), and I applied the general ideas to my classwork.

It's kind of like learning math. During a lecture, it's easy to think to yourself "OK, I understand this," but you learn so much when working through practice problems. I found myself saying "OK, that makes sense" when watching the LHTL videos, but I really saw the benefit when actively working on applying spaced repetition, diffuse vs focus mode, getting sleep, and other strategies to my studying. I was taking a few post-graduate CS classes at the time, and compared with my study skills and results from undergraduate, it felt like magic to study efficiently and get good results.