Pancakes,
What type of site did you reserve? Whas it a Partial Hook-up? If so that means you'll be placed in either loop 1500 or 2000. I've camped in both and my unscientific opinion was that loop 2000 (which is further away from the core area in the middle of the Fort where the pool, Trading Post, and campfire area is) had a shower line in the morning (it has two bathhouses but it's a big loop with lots of sites and people nearly all tent campers or pop-up people). The 1500 loop has a bathhouse shared with loop 1600 (which is a full hook-up) site and 1600 has more RV'ers who might use their own shower rather than the bathhouse since they have the sewer connection. Plus 1500 is a smaller loop with about 22 or so sites and NO shower line. Do what I did and call the Disney ressie line and ask them to place a comment on your reservation requesting the 1500 loop (I did and we got the 1500 loop at Thankgiving 2009). It's closer to the core area, quiet, and more shaded overall than 2000. But that's just my personal preference. It's just a request and not guarenteed but the campsite assigners try to honor those types of requests if possible.
Golf carts are a convenience and not a necessity at the Fort. If you have bikes I would suggest bringing those instead. If you're in the 1500 loop you're close to the core area (walking distance) and would need a bus to go down to the Pioneer Hall/marina area to catch the boat to the MK but the buses ran on time just fine when we were there last. I got a golf cart for the first time on this last trip and while it was nice to have I won't get it next time around. Foot power was just fine for me.
Also for your kids, every day at the core area of the Fort the lifeguards will run some activities that the kids can take part in and it's fun. When we were there we saw them set up a flag football game (sides evenly matched with little kids to grown ups on each side), a hula hoop contest another day, bingo sometimes, and other activities. You'll get an activity sheet when you check in and it's also posted outside the aforementioned bathhouses. It'll be a good way for the kids to mix it up with other kids there. Plus at the campfire/singalong/movies you can bring marshmellows to roast (you can even buy a stick or bring your own) and we've even taken hot dogs/buns/condiments and roasted those too.
Relax and enjoy your time at the Fort. Leave a day or two just to hang out around there.
Bama ED