Looking at anyone else's code in things I use. I just think to myself "damn this is so neat and structured, I've never made something like this"

Boy scout rule: leave things cleaner than you found them. Those classes probably weren't always so neat and orderly.

Just do this from now on as much as time permits: every time you need to edit a class or script to add or remove something spend 5 to 10 minutes cleaning up and improving its structure.

As an added benefit this will keep the code more fresh in your memory as you continue to build