I read Encouraging people to explain downvotes, its answers, some of the comments and later searching for it: I didn't find anyone mentioning the Follow feature that's available since March (updated in June) 2020.
(This question seems currently best possible answer to Option to be notified when a post I downvoted is edited but this way I couldn't issue a feature request. It is a bit of an answer (or comment?) to the question I quoted in the beginning.)
In my experience, it's absolutely helpful for keeping track of questions and answers, especially of those I down-voted. I think it perfectly matches with the ability to re-vote after changes (commented downvotes not only support changes for the better but ease evaluation).
Wouldn't it be useful to automatically follow a post by downvoting it?
Edit [clarification]: I am in no way suggesting that downvoters be condemned to follow the post forever. It's just about automating the extra click on follow.
Note that Unfollow is always just one click away.
Edit: I see that following is not an option to some people and therefore replaced the tag [feature-request] with [discussion]