One other thing that may affect how people feel about booting up in the car -- whether they need to go inside anyway, for example to buy a ticket, use the bathroom, meet people, or wait for the lifts to open.
Specific to my "home mountain" (as close as I have to one anyway - Whitetail):
-- The walk from the parking lot is probably 150 yards and includes a flight of stairs, and sometimes some ice
-- To get on snow you walk right past the cafeteria/boot up area
-- I have to stop and buy a lift ticket too
So I generally walk up to the lodge, drop my skis off, buy my lift ticket, step into the cafeteria and boot up, then step back outside and grab my skis and walk the 50 or 100 feet to the lift. Futzing around at my car to get my boots on, then still carrying my skis and buying my lift ticket, etc. in my boots seems like a pain.
The only problem with booting up indoors, is having to wear my boot backpack to the lodge. The only problems with booting up at the car is the inconvenience of not having a good warm place to sit and boot up (and put my neoprene knee braces on), and having to walk around and stand in line in my boots. I MUCH prefer to just wear my backpack.
Apologies to
@UGASkiDawg, because I am very clearly overthinking things now.