I'll admit that I used to think all fat skis were crutches. But a friend convinced me that I should get a pair of rockered skis for our heavy PNW snow. What I've found is that they are enablers (rather than crutches). I'm talking about enabling a skier to tackle snow that is so heavy its basically unskiable on any traditional ski due to the resistance of the snow and lack of pitch.
Oh, and it definitely takes a reasonable level skill to ride this type of ski.
Also, while I think better tools can help compensate for some skill deficits, extra float can make something that is not bottomless on a narrower ski, bottomless, which can increase the fun factor even for a skilled pilot.
I had no problems and a great time overall skiing some 4-12'' fresh over hardpack/ice on some traditional boards recently. In general, I think I prefer to ski in powder rather than on top of it, but thought it would have been great to have something with just enough float to almost, but not quite bottom out (with the accompanying ice scrapper sound and feel).