I prefer my F3 with MD4 drive attached and lenses up to 135mm, the 2.8 180 I have is alright, but somehow, it doesn't feel right compared to all the other smaller (and lighter) lenses.
I have just spent 3 months in Germany and Spain walking around virtually every day with my bog standard F3 with a 28/50/135 group of lenses. I have a home made camera strap made out of 25mm webbing, about 1.5 metres long, but folded to an appropriate length, that is always slung over my head and under my left arm always with one of those lenses attached, generally the 28mm. I can hand hold down to 1/15th these days and feel completely at ease as with the weight of that camera and any of those lenses, it's rock steady (within reason that is).
Upon arriving home I went out a couple of days later with the MD4 drive attached, this transformed the camera and as it was the middle of winter in Australia with dreary weather, I was shooting down to 1/8th with the 28mm lens easier than with the naked camera. I think a combination of weight, ergonomics and the wonderful shutter button arrangement on the drive body, made the difference.
I swapped with a professional sports photographer my F3 with MD4 drive for an hour or so for a Canon new F1N ( think it was that) and it's drive at the 1984 Olympic weight lifting trials in Melbourne, first time I had used one of them. He was offered a fast 300 lens for the trial but didn't have a Nikon body, so he borrowed mine. At the completion of the main trial, and because there were international judges present, there was a small Australian group that tried to do an Australian lifting record that would be recognised internationally. I borrowed back my F3 with the fast 300 and monopod and was able to get some extremely sharp pictures at 1/15th, I put the sharpness down to two things, the lens and monopod, plus the mass of the camera/drive combination.
Mick.