I agree. I find I get more mileage out of leg blasters for skiing than any other exercise I have tried. They work great as in-season maintenance, too. I just dial back the reps/sets a bit and try not to do them when I know I will be skiing in the next two days. In the pre-season, I add them to my typical heavy squatting/deadlifting routine instead of replacing the heavy lifting. If you can get through the full workout by your first day of skiing, you won't have any trouble with fatigue in the early season. For reasons I don't entirely understand (since the point of them is they mimic eccentric movements in skiing), leg blasters really help with mountain biking. I have been doing full sets of blasters for about a month now, and I did a 10 mile ride with about 1300 feet of elevation gain a week or so ago after nearly a month off from biking with little trouble. I was really surprised as normally a month off from biking leaves me really out of biking shape.
I also agree that lots of core work (russian twists, scotty bobs, planks), balancing focused stuff like squats and tuck positions on bosu balls, and dynamic movements like lateral hops over sandbags all translate to skiing very well.