I've never been on the 3D version, but I remember being about 5 years old and terrified, holding on so tightly to the armrests that my knuckles were white. I loved it every trip after that, and was never scared on any other rides like Thunder Mountain, Space Mountain, etc. I think you never know until you try it. I wonder if my 4, 5 and 7 year old will be willing to try it next year.