"How tall IS he, anyway?"

Just a short and quick observation. When you're at any of the Disney parks, there are handy boards around that tell you how long the wait time is for each ride. This saves you from trekking across the length of the park only to find that the wait for Space Mountain is 2 hours.

If you hang around these boards you can hear how people plan and negotiate with each other. Which I was doing in Anaheim, when a family came by with their son. "Oooo, Splash Mountain is 55 minutes! David would like that." David, maybe 4 or 5 years old, nods vigorously. Then "Minimum 40 inches. Is he 40 inches? How tall IS he, anyway?" Parents look at each other blankly.

40" - 46" - 54" - who really knows how tall their kid is?

Because, of course, neither parent decisively knew. Kids that age sprout like bean stalks, and the last time you measured could have been 2 inches ago?

Once you get to the ride, the cast members have sticks to measure your kid. But if you're doing your planning at the board, it's a lot harder. It's actually impossible, because you can't measure at the board.

Easy experience design upgrade: measuring post located at all attraction boards, and everywhere else where people commonly stop to figure out their next ride.