I don't get altitude sickness, but I do "notice" elevation during my first couple days at higher altitudes.
That said, for me, the key is sleeping a high altitude. For example, when skiing at Telluride, you're sleeping at about 9,000 feet. So despite the fact that you're skiing at 11-12,500 feet, it doesn't affect me too much. Similarly, when I hiked Kings Peak, UT (13,528ft), we camped at about 11,000 feet the night before summiting. I don't remember being winded by elevation, more so by the death march that was the exit from the wilderness (30ish mile day).
On the other end of the stick, I definitely notice the elevation when skiing at comparatively low Snowbird (9-11,000ft) when I'm sleeping at 4,500 feet in the valley.