While mechanically similar, chairlifts and gondolas should be separated when talking about loading issues. Gondola stops fall into the following categories, many of which can be avoided.While true, I have been on enough chairlifts and gondolas at ski resorts to know that it does happen, and usually not for 'emergencies'.
-Misloading. Unlike with chairlifts, these can mostly be avoided on level walk-in gondolas and enough well-trained staff.
-Loading and unloading of supplies for restaurants, shops, etc. Can be done outside of operational hours or by other means if the operator so desires.
-Electrical or mechanical faults - rare and downtime can be minimized with maintenance staff at the lift rather than on call. Ski resorts tend not to have a mechanic at every lift.
I'd argue the summer crowd at ski resorts is surprisingly similar. The bigger resorts that tend to operate gondolas have really transformed into adventure parks with mountain coasters, zip lines, climbing walls, ropes courses, etc. We also get bus load after bus load of retired folks all summer with lifts to 10,000+ feet that require almost no physical ability to ride.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.