I don't really think it will make me any more productive, but I do think it will narrow down my focus to the subject matter I am photographing instead of thinking about the gear. An example of this would be if I were trying to capture a candid image during a social gathering. If my only choice is a Nikon F3HP with either a 24mm, 50mm, or 105mm lens, then I would reach for the appropriate lens and grab the shot. Now on the flip side, if I had the F3HP and an F100 plus the 24, 50, 105 lenses and a couple of zoom lenses all in the same bag, I believe I would dwell a bit more on which camera/lens to use in order to get the shot. When I'm getting the shot with whatever camera/lens combo I select, there will be a slighly nagging voice inside me telling me that I probably could have gotten better results if I had gone with the other camera/lens combo instead.