Eastsucks and the whole east vs. west argument. I grew up in Colorado (in the 1960's no less, before everyone from the east and west coasts moved there), spent twelve years in the northeast (college, graduate education). I've skied both extensively.
There are a few major differences as I see it. First the snow. No question about it, the snow, especially in the central rockies, is as good as it gets. I have a co-worker who is originally from Germany. She is an excellent skier, and has skied all over Europe. I was able to convince her to take her ski "holiday" this year in the U.S. When she got back from Jackson Hole all she could talk about was how that was the greatest snow she had ever been on. Guess where she's going this winter? Unfortunately, the conditions in the east match this only a few days a year.
Secondly, the terrain. The "great" areas of the east (Killington, Stowe, Sugarbush, Jay, etc.) have terrific terrain and, in my opinion, can stand with the ski areas of the Rockies. However, there is no question that there are far more "great" ski areas in the Rockies. There are many areas in the east that are small in terms of acreage, vertical, lifts, etc. You just don't see as much of that in the Rockies. Some of these areas are great for families and people who are just starting off in the sport.
Lastly, the skiers. 90+ percent of all skiers, at any resort, north, south, east, west have $1500 of equipment and $.10 of skill. They're there to see and be seen. They have no passion at all for the sport. They're rude on and off the slopes. The remaining small percentage of skiers are enthusiastic and passionate, and they ski where ever there is snow and vertical; be it New England, Colorado, or the midwest. Great skiers come from all over the nothern and western parts of the U.S. I believe Billy Kidd was from Massachusetts, and of course Bode Miller is from New Hampshire, just to name a few.
That being said, now that I live in Florida, when I take my two ski weeks every year, I do head for Colorado.