Is it possible to know who, if it's the owner (similar to accept, but just a vote) voted my question/answer up or down?
By this feature we can come to know if you are being voted up by question owner or persons giving other answers to same question or just the visitors of that question thread. Also, according to a comment on another post, "feature" means "how to do"; not add a feature request.
If it is a group of people giving other answers, then your answer is most correct If it is readers of that question, then your answer is more popular. Without identifying a specific user.