But on the flip side I would think that at a ski resort you are going to see far fewer people with infants or little kids in tow, or people with mobility problems which are more common at Disney.
Disagree. Just spend one morning at a major resort gondola and you'll see ski school after ski school class loading the gondolas. And think about these classes. It's pretty common to see one instructor with a bunch of 5-year-olds in tow. Not only that, those 5-year-olds are wearing ski boots and trying to carry heavy (for them) skis with sharp edges. And their skis aren't long enough to fit in the outside holders so they bring them inside the cabin. Oh, and they can't see where they are going since they have helmets on and their goggles are fogged up.
See these kids at Whistler in the below pic? They all loaded the Whistler Village Gondola that morning, carrying their own gear, without their parents. The main Whistler Kids learning area is at mid-station of the gondola. I can tell you from experience, the gondola doesn't slow down!