Would you go alphabetical within each year? How do you do it now? The organization process would be a good way to remind yourself of what you have!
I re-organized by genre a month or two ago (which, in hindsight, was maybe not the best decision), but I did it for the same reason you're thinking, though - I needed a fresh way to pick things to listen to (although my selection isn't nearly as big as what you have haha).
A bit of an aside, but I have a friend who keeps his physical media in (for lack of a better term) "when I bought it" chronological order; in other words, it starts with the first CD he bought and ends with the most recent.