I just used my Qld drivers licence, never showed my passport
They basically just want a photo id, sometimes.... depending on the person. They didn't always ask for it, actually at restaurants I was not asked once. The only places I was asked was at the World of
Disney store in DTD (and not many times) and the merchandise shops in Main Street at DL park. Was never asked at the hotel shops, CA park shops, other DTD shops (the vinylmation one).
I was also often not asked when I was charging to my room, they obviously thought my room key was id enough.