Just saw a post on the voting history that Voyager has as a feature and I think it would be neat feature to adopt. Even for users like myself that makes use of user tagging already, I think it would still be useful and complimentary.

This may also provide a bit of a framework for different requested feature, a history of your upvoted and down voted posts. I didn't use it much on Sync for Reddit but it was situationally useful.