Anecdotally, I also use the upvote button when I'm about to comment on something but then see that someone else has said it better than I could have. Instead of

Anecdotally, I also use the upvote button when I'm about to comment on something but then see that someone else has said it better than I could have. Instead of two comments that state roughly the same thing, the one that was posted first rises farther to the top.