I'm guessing most of you who are having this ground loop problem have never taken flight lessons before, which is fine (and I recommend you get out there and do it it's a blast:P), but let me just throw my two cents in:
1) There is no rule at any airport, anywhere, that you have to exit the first taxiway. There isn't any reason to be braking that early when you have plenty of runway in front of you.
2) The F18 is a much smaller aircraft than say, a 747. It is light enough that it will naturally slow down fairly quickly with aerodynamic braking/air brakes. Big jets need all that sweet reverse thrust/extra braking because it's like trying to stop a freight train.
3) Your landings should be dead centerline, straight down the runway, every time. That eliminates problems. If you happen to be off a little bit, don't be in a rush to get back to the centerline. Using rudder at 80 knots is like jerking your steering wheel on the highway. Also, plane going in one direction + wheels facing a different direction = bad juju/repair bill when you touchdown. Keep it facing down the runway or you'll run into problems. A good way to make better landings is to practice slips. When I come in for a landing and I'm off center, my CFI won't let me touch down until I've slipped into the correct spot. Handy for crosswind landings as well.
4) If you ever land and immediately hit the brakes, or god forbid hit the parking brake (shudder), prepare to get punched in the face by your flight instructor. He's going to be upset that you just ruined his brakes, and you might be about to kill him in a bad ground loop. The correct landing procedure is to come in, flare, and when your wheels touch HOLD THE NOSE UP. Then you can gently ease it down (don't try to hold it up forever, eventually you'll run out of speed and you may drop down on the nose wheel hard.) By this point you should be able to start gentle braking without any problems.
Now I know Cherokee Warriors land waaayyy slower than an F18, but when I land at KCLL IRL I'm able to not do any braking at all until I'm actually taking the first exit ramp. If you're landing your F18 at the correct speed in the correct configuration, you really shouldn't have to do much braking until you're ready to exit either. I know much of this problem has been attributed to the realism settings, but if you set yourself up for a proper landing and pull it off correctly you shouldn't have any problems
Cheers