Nah...the show hasn't jumped the shark, but occassionally they get a weak episode. I LOVED the Godfather references and Nelson trying desperately to backpeddle.
The episode with Homer and "Epcot"; Homer didn't win a trip. They were going to Epcot to watch/support Mrs. Krabbapple who was nominated for "Teacher of the Year". That's where the event was held. It was hysterical!! As they wre flying over the park, Homer quipped "Ohhhhhhhhhh...it's even boring just flying over it!"
Then of course there was the spoof of Spaceship Earth sponsored by Eastern Airlines (where Eastern Airlines has become overlord's of the planet and enslaved the masses). And the Electric Car pavillion, sponsored by the gasoline makers of America. Where they rode through the attraction in an electric car who narrated "Hello, I'm the electric car. I can't go very fast or very far. And if you drive me, people will think you're gay..."
At the end of the show, Homer (desperate to escape Epcot) tries to climb over this large brick wall to get to the MK on the other side. When he does, an prison alarm sounds and lights start flashing as you hear Homer yell "It's so beautiful!! ..........What?!?!? $14 for a churro???????......one please..."