There would be reservations that opened up, but not like it is now. Pretty much every location, anytime you want.As someone who only dines at character meal etc i will respectfully disagree. As my trip approached especially 1-2 days before as day of. Ressies would open up at almost every one of them and at pretty favorable times as well.
edit: Of course I could be misremembering. I am getting up there in years.