Yes! We went in December and had an absolute blast. To be honest, we enjoyed it more than any Disney park. We are ALL space nuts, however, as my father designed the main propulsion system of the shuttle and has his name on a wall to honor him at KSC. At 76, he’s still working full-time as an aerospace engineer.
My dd did have fun, but I don’t think she got the “big picture” as much as my ds did, however. But, my son at this age would have totally gotten it. I think it’s an interest thing. If your ds is into space and rockets and stuff now, he’ll enjoy KSC.
We didn’t spend that much time at the visitor’s center. We did the Lunch with an Astronaut where we ate with Jon McBride, the NASA Up Close tour - they take you out on a chartered bus to the launch pads, to see the actual space station modules (that haven’t been launched in the past couple of years due to the shuttle crash), and finally to the Apollo building where they do an absolutely wonderful interactive presentation of the original lunar missions. They move your group from theater to theater, including one that has the actual control room from the Gemini and Apollo missions as it’s stage - the control room was there and they built the theater around it. They also have the full Saturn rocket suspended from the ceiling in the obviously very enormous lobby. After that, we went 6 miles down the road to the Astronaut Hall of Fame, which is chock full of interactive presentations for the kids to explore, such as moon bouncing, space smells (such as sulfur), and seeing some of the actual capsules up close from the Space Race era. Really fun stuff.
I did post pictures in my trip report in the trip report forum: