I always did wonder why they used the name Pizza Planet for such a generic little place... after all the name does evoke the awesome place from the movie with the huge arcade, the spaceship, and the weird milkshake dispensers (that i would pay so very much for). I feel like this restaurant was a placeholder or something put in for the extra capacity the park once had and so more food was needed. I just can't wait to see this place used for a better purpose! I still remember the sad little arcade from my experience there a few years back and thinking about how desolate the place looked!
Probably because they skimped on budget.
Look at Pan Galactic Pizza Port in Tommorrowland at Tokyo Disneyland:
It's like Pooh's Honey Pot. The Tokyo Disneyland version is a $130 million trackless ride and blows away the stale Magic Kingdom version.