This problem is actually the main reason I haven't moved to SLC yet. So much of the draw there is about being able to get up into (and out of) the mountains quickly, and during ski season (as you know but other readers might not) it can get really terrible. Like worse than I-70 west of Denver terrible
I have tried the ski bus approach, but had a frightening experience of being on one of the last buses down on a crowded day when LCC went into an interlodge event. I have heard a lot of proposals for solving the problem, from gondola to restricting car access and pushing people toward the buses, but so far I think there is no end in sight?