All of the other times, it's really just irritating, and I've only gotten more annoyed lately because of it. Netflix just promotes its newest shows, and frankly I don't watch that many Netflix originals. Youtube... the recommendations are fine, but the next video selection is very little hit and mostly miss for me.
Personally I'd rather prefer autoplay being something I give permission for than the site asking for forgiveness (which in 99% of cases I will answer by muting the site permanently).
Know who else's algorithm has done the same thing for me? Pandora. It's basically my go-to music app. I have groomed a station to be exactly what I love and it just sticks to a formula, automatically adds in new releases by the artists I already follow, and plays music I like.
I can't think of a single time when I have encountered autoplay and liked it. Not even with video streamers like Netflix, YouTube, etc.