We just got back from 2 days (12/6 & 12/7) and wanted to do all 4 parks. For US it was worth it. We did HS & Epcot one day and AK & MK the next days. All in our party were over 21, so they wanted the “big” rides…RoTR, FoP, Everest, RnR, ToT, TT, Splash, Space, etc. Since we had limited time, not having to wait 60+ minutes for most of these rides was worth the extra $.