summit county is pretty high up.... higher than a lot of the mecca's in the big mountain world. Alaska for example, when they are in town they are at sea level, and the peaks of the mountains are, oh around 2000m. really no big deal as far as altitude goes, especially when you consider the amount of time you actually spend on the peak as opposed to sea level.
Vail Village in comparison is just shy of, if not 2500m, the peak of Vail Resort being just shy of 3500m. now that is high elevation living. The only time I have ever actually felt altitude was when I've been in Vail.
Science says that you don't really need to worry about altitude until 3000m. anything below that and, yes, you can feel it, get tired, and all that stuff, but nothing serious can happen below 3000. once past 4000m you have the risk of super cereal shit happening to your body... and I'm pretty sure that in Nepal you need a special permit to go above 6000m. Gulmarg is India tops out at 4000m give or take I believe....
so you guys in Summit County jibbing your rails and hiking your pipe are having a much harder time with altitude than anyone here in British Columbia is touring around the backcountry bagging peaks. I live in a town that sits at 1000m, third highest town in the province by a hair, the peaks of the mountains sit between 2000m and 2500m.... within two hours or so we can reach peaks around 3000m, but there's nothing higher.