Building on what Nancy said, some of the lifelines will be long by Aspen standards. Around 9:45, ski school for kids leaves and for adults it's at 10, so the lift line at the base of Snowmass, the Village Express, can get to be 10 minutes or so. It's unusual for us to have lift lines that are more than a few minutes, but it can happen on holidays and when the upper lifts close due to wind (infrequent) or due to poor snow conditions (not usual, but it was an issue last season.
Nancy and I changed from the Front Range to Snowmass several years ago -- Nancy did leave Breckenridge a couple of years before me. We are nothing like Breck/Summit County/other Front Range ski areas. More than a decade ago, Breck was getting over 23,000 visitors on December 27, usually the peak day of the season. Aspen's peak day, across all 4 mountains, is less than 15,000 visitors. There's a big difference in the quality of the ski experience, IMHO.
Mike