With the two spinners (a major upgrade that you conveniently ignore in your hatred for Storybook Circus), the wait is almost never more than 15 minutes and it's a walk-on much of the time. We rode Dumbo with our daughter multiple times on each trip in April 2015, January 2016, and May 2016, and we never once had to take a pager because there was no wait. So I think you'll manage.
Separately, is your argument that it would be better to stand in line and do... nothing? Given the option, isn't a system with entertained children and bored adults better than a system with bored children and bored adults? That's what waiting in line is.
Bad parenting means the area shouldn't exist? The solution to "underoos baking like a fecal matter souffle" is a fresh diaper and a splash of baby powder, not the demolition of a splash pad.