This is the first year but vail is enormous so even on the busiest days it's not horrible. I spent the last four days in copper for my sons comps and I now fucking hate copper. Gaper galor and lines that are insane. Vails lines move fast overall and it's rare that you have to wait when it isn't a holiday. Most people will stick to the golden peak side or vail village area. The backsides and Blue skys outer areas, lions head and steeper blues and black runs are pretty empty generally.
Busiest lines are the gondolas, chair 4..... I have never waited more than 20 minutes on the busiest days in the group line cause I had family here. Usually I just hit the singles line and might wait 2-5 minutes when it's packed.