A very good question. I admit the answer is no ski area in the east would really hold my attention for an entire week's vacation. Those that come closest are are Stowe, Sugarbush, Sugarloaf, Why, because of size, steeps, variety of terrain, and opportunities for OB exploration. Second to these in my mind are MRG, Jay Peak and Cannon for much the same reasons, trees and exploration opportunites. Usually when I spend a week skiing in the NE I safari around to different areas.
I think Whiteface has tons of potential that, sadly, is far from being realized. That's just my opinion and my skiing style. It's a great place for carving steep groomers. I guess that's just not my thing.
If you hire a guide they will take you to places within a 45 minutes of LP that will give more OB exploration than you could cover in a season.