I skied with a few friends at Jackson Hole, Grand Targhee, and Alta in early December. We were home before the holiday period started. My general impression is that independent destination resorts like JHMR and Alta have done more effective training for lifties and other staff regarding mask usage and distancing in lift lines. That's based on first-hand experience and what I've been reading from Divas and others.
While a few lifties at GT were reminding people to cover their noses while in the lift line or as they were getting ready to load a chair, that happened less consistently. GT still does hand scanning of lift tickets or passes. The scanners were asking people to turn their ticket, if necessary, in order to keep a little farther away. We were at GT on a sunny Saturday that was the first weekend with pretty good snow coverage, so locals were out in force. The lift line for the teaching/beginner terrain stayed long well into the afternoon. People were pretty good about mask usage indoors in general. At JHMR and GT, we mostly went indoors for a quick stop in the restroom.
Turns out that Alta has a big advantage when it comes to distancing at the base of lifts because they use the "front row" process for the lift lines. The basic idea is that there are a set of parallel lanes that end at a pre-loading area in front of the RFID gates. When the gates are clear and there is space after the gates that is the actual loading zone, a liftie calls out "Front Row" and the groups (1-4 people) at the front of each line pull out, turn 90 degrees, and head towards the RFID gate. Don't know how things worked before RFID was installed for 2007-08 but by now it's standard practice that's well ingrained for Alta regulars. There is no Singles lane this season.
Plus Alta has a lot of space for longer then usual lift lines with ghost lanes in between for spacing. For instance, Instead of 6 (or 7?) lines for Sugarloaf (mid-mountain lift), there were 4 lanes with a 3-ft ghost lanes in between. When it was busy the lanes were three times as long as usual, with the end marked by small blue fences that blocked entry to the ghost lanes. On Friday morning when it was busy, they were adding length around 10:30. On the previous days, there was a double length that was taken down after 11:00 or so. But if not busy at all, people can always duck the ropes and not have to go all the way to the end. There were similar adjustments to have more length and spacing for Collins and Wildcat.