Packing: backpacks, bags, organizers, compression sacks, all kinds of things like this. People loathe packing while I just love to play Tetris with my perfectly organized stuff. I have too many bags.
Role-playing games: it is weird because I mostly collect them since there's no time to play (nor to learn new rules).
Automation: why spend 2 minutes manually something when I can spend 2 hours failing to automate it?