I'm a late o-scale bloomer too. A o-scale newbie. I enjoy watching hobby videos on occasion. I will watch mainly videos that pertain to the scale that I'm playing with at the time. And I also enjoy at times watching layout overview videos as well, stuff like where they might show a layout in progress or maybe a video of the completed layout and voiceover or whatever.
I'm a very visual person so I enjoy videos. Its much easier for me to watch a video on how to rebuild an E-unit than it is to read instructions how to rebuild an E-unit for example.