Well, if you have tried the 70-300mm VR and 80-200mm, you might get your answer immediately. Although there is no VR for 80-200mm, but somehow when you hold it and look through the viewfinder, it's pretty steady;
Go and try in Nikon BTS, use the 70-300mm VR, off the VR, and look through the viewfinder and try to get a steady shot; then do the same with 80-200mm and you most probably will feel the difference.
Next, it's the aperture advantage, with f/2.8, which can compensate for the 70-300 VR's aperture.
Finally, look at the image quality and sharpness, it's different... as another plus, if you're shooting portraits, nothings beats the wide aperture which you can't get from the 70-300mm VR. The ability to separate the subject and the background, blowing the background away smooth and nice.
The best answer for you is to try it yourself.
You bought new?
If you're using with Flash, you can lower down the shutter more as the flash will help to freeze the subject and reduce blurred picture. I've seen sharp portrait image shot at 200mm f/2.8 without IS, shot handheld at 1/30 secs with Flash.
... With VR2 I can get tack sharp every shot at that kind of shutter speed, not breaking a sweat at all