Golf carts have been around since the '50's. Although I doubt they were used in CG's back then, I also don't think the average CG was big enough to need one back then.
Our CG is pretty big with over 450 sites. It would take me 25 min to walk to the camp store and back. I'm getting old, and when its hot and humid out the last thing I want to do is walk to the store and back.
I think the cart safer than taking the truck... Kids are running around on their bikes and warp speed not paying attention and it's tuff to see a kid on the passenger side of the truck. The cart is small and wide open, and I can see the little brats much easer.