Those pictures are great. It makes me want to ski there even more.
The New Zealand terrain sounds a lot like the Cascades. Actually, I think it is similar, in that it is very rugged and quite varied. If so, that means that much of that steep 90% is simply too steep to ski. So, maybe there are a handful of places where you can ski that mellow 10%, with just a smidge of steep, but not too steep stuff thrown in. Of course, just because I think something is too steep to ski, doesn't mean there aren't folks that will ski it. For the second time in history, a group just skied the Pickets: http://www.nwhikers.net/forums/viewtopic.php?t=7981596
That third pick is rather stunning. Unlike Roger's pictures, the thought "Oh, cool, I could ski that!" doesn't cross the mind. Of course, neither does the thought "you should try it with flimsier gear".