... how does it make a difference to the rest of the mountain if there are 300 people standing in line at the base or not? ...
All I can say is that a 13k skier visit day (which is a fairly busy day) no longer feels like a madhouse.
[warning: speculation ahead] I think the Gondola is spreading people out across the other lifts more, and more people are lapping to the bottom and taking the gondola back up, instead of lapping the Eskimo or prospector. For me, at least, once I was out of the WP base, I took the Eskimo back up because skiing down to the bottom via Hughes/Sale/Parkway felt like a giant waste of time. Now I'll happily ski down to the bottom, enjoy another 500 feet of vertical, and Gonolda back up. I think decisions like that have simply spread out traffic across lifts, because there's no more "don't go there, its not worth it" zone.