Most of the resorts on the Epic pass (Keystone, Breck, Vail, Beaver,) are going to be the worst.
Copper and Winterpark probably going to be really bad as well but not as bad as Epic pass places. The Mary Jane side of tends to be less crowded but the terrain is tougher.
Loveland is probably going to be better but that's only relative.
Thursday and Friday are going to be tolerable at Winter Park. If you can, check out Loveland on Saturday and Sunday.