It's not that I memorized functions and key mappings by watching videos , but without an engaging demonstration of them in video, I'd have had no clue what the possibilities are to begin with. If I'd just read about it, I'd probably have lost interest.
Often I use videos to get an understanding of the landscape and the possibilities of some subjects, and then turn to documentation and tutorials for a deeper comprehension. For me, videos aren't a replacement for reading.