[eco]

One of the best things in SponsorBlock is Highlight segments. If the video is 10 minutes of filler building up to a single interesting/exciting moment you can often see exactly on the timeline where to jump to.

[lolinder]

That's also present in the regular YouTube video scrubber. Maybe less prominently?

[unstatusthequo]

I think that only shows up when a video hits a critical number of views so it knows where people watched and rewatched.