Count me in as another parent who doesn't believe it's "more important that the kids see the show".
What makes one person more deserving than the next?
Is it youth? Why? What if the person trying to see is 85 years old and has terminal cancer and this is their first and only trip to Disney? Does your healthy 4yo have more of a right to see the show than that person?
Every person has a story. That six-footer can't help his height, but the rest of us CAN resist the urge to put our children up on our shoulders. I think the highest your child should be is up on your hip, level with your head. Or, if they're small enough, in a backpack carrier, looking over your shoulder.
One of the important lessons I've tried to impart to my children is that their enjoyment isn't ever more important than that of others, for any reason, whether it's youth, beauty, wealth, privilege, etc. We're all in this together.