I will add
Sci Fi Dine In to the possibilities. My reasoning is similar to the first response (Vacationer 1954) regarding 50's PT; uniquely Disney.
Sci Fi was the first 'themed' restaurant at which I ate...anywhere.
Long nostalgic backstory = skip this unless you are really bored..
It was Spring 1992. My wife and I and another couple, all in our mid/late 20s, drove 18 hours straight through the night, to visit a high school friend in West Palm Beach. The six of us ventured to MGM Studios for the day. We arrived with no tickets, no plans, no fast passes, no dining reservations, no Magic Band, no
MDE, no cell phone, not even a credit card. Just some cash in pocket. Heck "we were young and wild and free". We bought our tickets and grabbed a park map and wandered from attraction to attraction, with no waiting.
We got hungry so we went into the nearest place to eat: Sci Fi Dine In Theater. We laughed. What was this supposed to be? Looks like some cheesy plastic cars that sit outside Gold Circle that moms pay a nickle (a whole nickle) for their toddlers to bounce around for 30 seconds. We sat in our car, gasped at the outrageous prices for food (remember, young, no money, burger was probably $3). We watched, what I am guessing is, the same movie reel they play now. We ate, got full and left...oblivious to what we had experienced.
For me, that was the start of my love for Disney World. Only I didn't realize it for 13 years. It wasn't until we returned in 2005 with children in tow, that I began to appreciate the 'themeing' of Sci Fi and all things Disney. We spent the next decade returning to WDW with kids, annually, to experience all the new and old through their eyes. Now, as AP holders and biennial visitors, with grown kids, I long for that first experience of walking into Sci Fi, and experiencing quintessential Disney.