Albert, I agree with you. For shooting landscapes, which I think you do most of the time, the only real advantage of the FX is the wider shot, better for panoramas. I guess it will also be better for those late sunset shots and other low light situations. But, as a landscape photographer you are using a tripod for those anyway and you can shoot at a lower speed.
As I suspected, where the D700 will shine is not in daylight, but shooting weddings, concerts, and other indoor situations.