Schumius, all I can say is that you generally get a larger plot or space than you do in the US. As in all countries Campgrounds off the tourist trail will be less crowded and possibly more "Quaint".
Check Wade Hatler's site for a lot of Aussie info and great photos, especially in the Outback.
http://www.wademan.com/VisionQuest/VQ_Australia1.htm