I called WDW DINE this evening to make our ADRs and the CM asked me what ADR meant. I thought that was a little strange. She said she had been working there 6 years and never heard that term. I was surprised!
I think it is funny since we use these terms so frequently on these boards I have to pre-script myself beofre calling dining and spell the words out so I don't say thngs like Ps's/ADR's, AP's, MK, refer to resorts by their acronyms, etc.
I still call the priority seating when I call. About half the time the CM will mention that they are now ADR's. I guess some of them are having a hard time changing over as well.