There also plenty of rides that have <15 min waits throughout the day and will not need rider swapThe difference, again, is that there are many attractions with no height requirements that such a family would be able to ride together throughout the day and throughout their trip.
For a family with a disabled child using this because their child is unable to wait in the physical queue, this will be for all rides save the select few in a day that have a very short wait. That is a fundamentally different experience than the family you're referring to.