Scrap whatever familiarity you have with the WDW plan. There is technically a prepaid plan. It has zero built in savings. They give you, based on how many days of the plan you purchase, paper vouchers** for specific dollar amounts, that you use in lieu of cash to pay for your meals. You pay for how much the vouchers are valued at ***. It's not very popular. We used it once, the four 4 play I believe. I hated the paper vouchers. They also don't give you change back. Now, I never found a problem being able to "underspend" the vouchers and lose money, but it was painful to decide how many to bring, keep track how many were left, etc. Plus one of my DD's bottles spilled on them and I hated keeping track of them.
** - just heard today on a thread today that for the first time ever, Disney sent out a pin code for DL offering "free dining" when you stayed onsite for a max # of nights. First time ever. Also, according that Diser, her DH was told they would not have paper vouchers. About a year & a half ago, IIRC, DLR did test a "card" system, preloaded, similar but not identical to the KTTW concept.
*** ok, so technically because during "peak times" the pricing for character meals goes up slightly, you may save a few bucks on the vouchers that covers "premium character dining" (which is Goofy's or Ariel's breakfast/lunch ONLY not WOC dinner packages). But other than that- you don't save.