Here are my memories of the old plan.
You got 4 vouchers Say, a $15 Breakfast, $15 Lunch, $10 Snack and $20 Dinner one for $60 dollars.
You had to buy them for the entire package stay, say 4 days worth.
Vouchers were in park only, no hotel or DTD options.
No change, so you had to do the math in your head, and with prices at least 10 years ago, you usually got more food than you could eat.
Many folks didn't use all 4, and even if they did, they didn't use the full value of each voucher. So you paid $60 for less than $60 of food, and HAD to eat in the park for all meals.
It just plain sucked. Almost any internet planner, travel agent, other people's suggestions, said Don't Buy the DLR plans. (Many still recommended the WDW version, as it was much more flexible and could save you some money.)
I remember guests giving me their extras (the expiration date was fairly quick), which was nice for me, but I also got the stories and saying never again. And I could usually get two meals worth of food from one voucher, just knowing the menus and good deals.