I was a peaks pass holder for a season when I was working up in that area. I skied Wildcat probably 25 times that year. I have never found it to be very busy, I did ski mostly midweek but I don't think the weekends ever get too crazy up there. Wildcat doesn't fit into Vail's business model. They don't have the greatest bar/restaurant and they aren't super high volume. Mount Snow, Hunter and Attitash are the prizes for Vail in that peaks deal.