DS4 LOVED Splash Mountain last summer. Dad (that would be me), not so much, DW, and DD13 not at all. I guess that means that Dad gets the honor of going on with him again this summer.
No worry of the little ones falling out, it doesn't work that way. However, DW was so scared, she had a death grip on the hand rail, and managed to pull herself off the seat, down into the foot well on the way down the big drop.