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Me too. I organize them by length. I have a folder for under 30 minutes, 30 minutes to an hour, and over an hour. Lots of good stuff in there that I always plan to get to, but generally I add new ones faster than I watch old ones.

I once went on an organizing spree and categorized the videos by topic, but never did that again, so the 1800 videos are now the uncategorized videos that are not in one of those more specific folders which I never visit either.

I am rarely in a mood to watch YouTube videos longer than 5-10 minutes for some reason. Shorter ones I often watch right away, but all the others get filed away for a rainy day.

For me, 90% of them are ‘second screen’ content that I leave on while doing something else.

Isn't history enough for you? I categorize just some interesting videos, but I know I can go back and look up for any video I have watched before.

Good you don't download them, that would grow the data hoarder HDD rack pretty quickly.