Hi Alan!
You can certainly add me to the "Big Kid" party! I think Frank Sinatra's "Young At Heart" classic is in constant rotation in my head :-)
Since Disney is so tailored to the little one's, it's almost impossible to get away from those offerings at any of their Theme Parks. But out of all of them, Epcot has always felt the most grown-up to me, and certainly offers the coolest rides and attractions of the 4. For the Big Kid in you, Epcot gives us:
*Soarin
*Mission:Space
*Captain EO
*Spaceship Earth
*Test Track
And what Big Kid can't go without checking out the awe-inspiring Illuminations water/lights/fireworks show!
So, if I were to choose one for you, it'd be Epcot. Frank Sinatra's song is about to play again :-)
Have Fun!