Yeah, basically every 15 minute YouTube video, because the amount of actual content I care about is usually 1-2 sentences, and usually ends up being the first sentence of an LLM summary of the transcript.
If something has actual substance I'll watch the whole thing, but that's maybe 10% of videos I find in experience.
One of the best features of SponsorBlock is crowd sourced timestamps for the meat of the video. Skip right over 20 minutes of rambling to see the cool thing in the thumbnail.
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I'd wager there's 95% of the benefit for 0.1% of the CPU cycles just by having a "search transcript for term" feature, since in most of those cases I've already got a clear agenda for what kind of information I'm seeking.
Many years ago I make a little proof-of-concept for displaying the transcript (closed captions) of a YouTube video as text, and highlighting a word would navigate to that timestamp and vice-versa. Such a thing might be valuable as a browser extension, now that I think of it.