I agree, it sounds like a port stop at Canaveral, and I also agree, it would not be worth it, at least to our family.
You would be able to get day-of FP+ with whatever tickets you end up with, but depending on how crowded it is and how late you get there, those can be limited and/or have a long wait at a kiosk to even sign up.
With kids those ages, you might have a lot of fun going to Downtown Disney, with Disney Quest. Or a water park -- Disney or elsewhere.
But getting off the ship, boarding a bus, driving an hour, spending maybe 4 or 5 hours max at a park, then boarding the bus and driving an hour back to the port doesn't sound like fun to me. Not to mention that those 4 or 5 hours will cost you almost $100 per person!
Have fun whatever you decide!