Sorry but the Tomorrowland Speedway has a 54" height restriction to drive alone. The average 5-year-old is only about 40". I remember my youngin's not being able to reach the peddle or see over the front of the cart. In addition, the steering wheel took a fair amount of strength to turn and they couldn't budge the thing. We'd always bounce from one side of the rail to the other.
By the time my kids were 40", we had
much better electric go-carts on a rail that they could drive located nearby. We also had 2-seat adult carts that I could drive for them at a pretty good clip. We took them on Tomorrowland Speedway once, but after what they experienced at home, they never wanted to ride it again.
Why the hate? They are hot, smelly, loud, ad eat up valuable real estate that should be used to build something better. Any child old enough to actually drive one is going to think they are the lamest ride ever.