Two days at Breck is completely understandable, and probably necessary. There is a lot of friggin terrain to cover! Personally, I like Breck better than Beaver Creek, but that is assuming there is snow. Without snow, it doesn't matter which Mtn you hit. The snow gods need to awaken ASAP, please!
Breck and Vail are busiest, obviously, on the weekends. Lift lines can be crazy at the get-go, but once you get up from the access lines, you should be a lot better. Get away from the pack and the lines will be much smaller.
Traveling the States and Taking Pictures