I absolutely use it for this because lots of videos drone on and pad their length for the ad revenue, so I ask the AI to summarize and then I can click through exactly what I want to see. I found myself actually watching more videos now, not less, because I know I don't have to listen to them for 10 minutes and waste my time when they don't get to the point.

Oh I agree, I use it for the same reason. It just seems counterintuitive to YouTubes bottom line (ie discouraging folks like us from watching to video to give them ad money)