I don't have a lot of videos so I'm probably not the best person to ask for that specifically, but I can definitely relate to the pain of having to organize a huge hoard of material lol
For me the most important thing was to be able to quickly sort + find by date, so I landed on this for my main folder:
For outbreaks, each folder then has separate subfolders for individual tornadoes, and I use the outbreak folder itself for more general stuff that isn't attached to a specific tornado. For example, my 5/31/85 folder (the numbering is just to keep them in sequence for my article):
There's more beyond that but it's probably not useful or applicable here. Anyway, I do end up with some folders that only have like one or two photos/videos/newspaper clippings/whatever in them, but I don't really mind because it's way faster and easier to find what I need or sort and save new stuff.