I just carry my boots from the parking lot and put them on in the locker room. Makes the walk more enjoyable especially if I come a little late and end up parking in the back 40. I'd rather walk in street shoes with my ski boots slung over my shoulder then have to walk a long ways in ski boots. If it's snowing I just put ziplock sandwich bags over the cuffs to keep snow out of the boots.
Works especially well since I bought some really hideous waterproof snow boots off of steep and cheap for $20. The things are god awful ugly, but functional and cheap so I can just leave them in plain sight in the locker room without fear of them getting stolen.