Disney has always asked if on a package (I think it is more for statistics as anything - when I worked at DRC, I asked too - 6 years ago).
The CM's aren't usually checking to see how many credits you are using (to see if you are going over on a package, especially since many times they don't know how long you are staying). Though they will usually say if a restaurant is more than 1 credit.
Of course, being on the DDP is important also in that you aren't supposed to be charged on your CC for CRT, Hoop De Doo, etc. (though they do take that information in case of cancellation).