Fortunately our community is not made up of robots but of people who have memories that are non-digital which can recollect which videos were voted on (when you weren't intoxicated or otherwise under the influence..). Playlists, comments and channels are also useful to find back the videos you up-/downvoted. We now also have more reason to check out favourite member profiles to access their libraries and upvote.

There are fortunately also automated vote-retrieval methods.
The auto self upvote for all pqed/sifted videos did safe some time (this included my self down votes (1, 2) but that's not a big deal:)) Members who used *promote/*save have all upvoted the video in question - could this be automated as well?

More ideas?