Thr biggest difference at DL is that restaurants will actually let you wait for a table. They won't turn yout away if you don't have an ADR. The majority of guests at DLR do NOT make ADRs. It will be like any major chain restaurant back home. If you go to the cheesecake factory at 7pm on a Saturday, you will encounter a long wait. Same at DLR.

My advice is to eat lunch at either 11am or 2pm. Eat dinner at either 5pm or 9pm. If you avoid the peak dining hours, you won't have to wait too long most places.