Not sure what you mean by "pay extra."
In essence, you are paying extra, because those 1 credit restaurants will cost 2 credits if you book them with the package. (Yes, Le Cellier is 2 credits at dinner, but they don't do dinner packages, only lunch.)
If you are asking if there is a cash surcharge, no, there isn't. The surcharge is in the form of an extra dining credit.
The Candlelight Processional package is not prepaid, so whether you have a dining plan or not is irrelevant at the time of booking.