Just Carousel for me. I was 10/11 for the NYC World's Fair then, and lived close enough to walk to the fair. But somehow IASW didn't do it for me, while Carousel did. So did the dinosaurs at the Ford pavilion.
I wish Disney would implement the multicolored, spinning light rooftop that they had on the GE pavilion. The electricity requirements may have been exorbitant in the old days, but with LEDs, it ought to be feasible now.