I would like to sort my comments by votes. My hope is to find my old obsolete comments and delete them when they don't add value to the posts. I assume that if they have an up vote at all, they are valuable. It may also be useful to get feedback on which comments are helpful to others.
You can use this query on data.SE.
Note that as @Servy mentions in the comments, high voted comments can be obsolete as well, so don't forget to look through those too.