I have a golf cart and I do not bring them to the small campgrounds as my feet can do the walking. But at the larger ones, no thanks, I really do not feel like carrying a basket or pile of stuff on a bike or walking that .5 miles. But you will never see me jump on it to go 2 sites over unless the plan is to load up more people and head that longer distance to the pool or otherwise.
Sure there are people who use them excessivly as mentioned here, but even on busy weekends I have yet to see any one place overrun with golf carts. Of course it could just be that either I know how to pick a campground on a holiday weekend, or I just have more tolorance then many others.
If you are looking for a cart, focus on the age of the batteries for electric. Anything over 4 years of age is asking to have to buy new batteries. Also there are both 48v and 36v on the market, but be aware that 8v tend to run longer per charge, but the batteries are wildly expensive when compared to the 6v batteries. That is one reason EZGO has stuck to 36v but does have a 48v option. You can generally find a used cart from a major dealer in the 1500-2k range recently off a golf course lease, but then the price goes up from there as you add a rear seat kit, paint it or add any accesories.
Also be aware that most golf carts are around 950-1200lbs with batteries depending on the cart and aftermarket items installed. So make sure your not blowing out your payload capacity once you load one up and pile the family in the truck.