[Disillusionist]

Probably worthy of its own thread, but MUDs can be less enjoyable if you've contributed to them on a number of levels. If you've painted rooms, and know the limitations of the template, puzzles can be less challenging. If you're a tester and know the math of the combat system, etc, etc, etc.

A trick to fool yourself into perhaps enjoying a challenge?
Build the worst character you possibly can, with your coding knowledge. Then play that character until you're eighty years old.