First of all, beside your camp site, the only other places to park at FtW is a 15 minute parking area for about 10 cars at the Meadow Trading Post, and the main parking lot at the Outpost. Other than that, there is no place to park in the campgrounds.
As to whether or not you
need a golf cart is entirely up to you. If you are tent camping, and reserved at water/electric only site, you will be in either the 1500 loop - which is very close to the Meadow recreation area, or you will be in the 2000 loop - which is close to nothing.
If your primary intent is to storm the theme parks every day/all day, then you will probably consider the $50+ a day for the cost of a cart a waste of $$. The busses & boats are adequate enough to get you where you want to go. If you will spend a lot of time in the campground and not the parks, you might want to rent a cart.
At the very least, bring your bicycles with you, because FtW is the BEST place to go bike riding. You may also ride your bike on the path that connects FtW to WL - but you can't take a cart on same path.
There is a "Sticky" at the top of this forum that shows a map of the campground.
Deb
