I have grips on my D200-D300-D700. That way they feel more like my D2h-D2x-D3s. I also use L-brackets on all six so they are always ready for attachment to my tripod or BlackRapid strap. For me this feels like the norm and I like the balance of the extra size and weight. Everyone needs to find their own preference for different conditions of course but with the removable grips that's easy. Mine stay on all the time.
I really like the increased battery capability and use EN-EL4a batteries in my D300 and D700 grips as well as the batteries in the cameras. I consider a camera without a vertical shutter release to be crippled. To each his own.
It is interesting to note that the D300 and D700 with grips are both larger and heavier than the D2-D3 bodies.