I'd happily put "completed a major Drupal version upgrade" on mine, if I'd ever successfully accomplished it. I think it was 6 --> 7; still gives me the willies to think about that attempt. Seeing that on a resume would be an immediate "wow, this person can handle a complex migration..."

Oh man, I have tons of experience with WordPress AND Drupal early on in my career. Good call, I'm not going to have these on my resume haha.