I’m starting to use labels, which allow me and you to organize and search posts by categories. You can use the label widget over on the right to see posts by alphabetical (well, actually the ASCII collating sequence) category. With over 4100 posts, I seriously doubt I’ll ever label everything, so the search widget will still be your friend when looking for something specific.
Edit: I’ve went back a little over 3 years. I haven’t labeled every post, many of them are ephemeral in nature and simply don’t merit it–who cares about the 2014 elections now except historians? I may label ones from further back if I happen onto them for some reason, but I think that’s going to be enough.