When I made our reservations, I told the CM we were on the dining plan. She still took my CC# to keep on record in case we were a no-show (or didn't cancel within the time frame), but there hasn't been any charge on the CC yet (and it was 4 months ago). The same thing for CRT--no charge, but they have my CC# on record in case of a no-show.
My CM was very knowledgable about the DP etc. I've read others who got charged for Hoop Dee Doo or CRT when they weren't supposed to. If that happens, call back and explain to the CM you get that your CC was incorrectly charged and it should be removed immediately.
Hope this helps.