When I bought the D200, it came with an MB-D200. Even as a D1-series user, I decided to try it without the grip. I actually liked it. I can (just barely) fit my three fingers on it, and it works for me. The camera feels more solid without the grip, which is plastic. I've hardly ever used the grip. I also hear (from Thom Hogan) that if you attach and remove the grip all the time, it can mess with the security of the coupling mechanisms. So, best to leave it either on or off for a while.
On the D700, the MB-D10 is metal, but still has a seam where it connects, as it doesn't have the rubber everywhere. It's also heavier and bigger than the D3 body, but not as good ergonomically (in my opinion).
Plus, I find the N80 with grip is about the same size as the D700 without grip (though not as solid).
btw, shooting a D1H one-handed last night was not fun.