I will say, at first I was skeptical Sponsorblock would work, but after trying it, I'm really surprised by how good it is. Even videos from smaller channels generally have annotations. I also really enjoy the other types of annotations, such as "highlight" which is often used to annotate when the important part of a video is. For example, during the 3 hour long launch broadcast for JWST, it was used to mark where the countdown starts.