I haven't flown on Sunday nights out of LAS for about 3 months, but they were not bad last time I flew them. I have not had a problem in about 6 months with lines at LAS, it is just not good for my ego to stand with the masses... lol
By the way, the lines this morning were, like, non-existant. One person ahead of me in the regular line. That was the day after a 3 day weekend.