so two things here:
1. They are installing quite a few more superchargers over the coming months. There is a map on the Tesla website somewhere that shows the planned superchargers; however
2. The main purpose of Superchargers is to facilitate long distance travel. This is why most superchargers are not installed in inner city areas where people could charge their cars for the normal short commute to/from work. The theory being that most people can charge at home and/or work.
This means the nearest charger being an hour from your home is exactly what they want. You leave home with a full charge, and sometime after you've depleted a significant part of the batteries charge, you can charge at a supercharger.
Edit: include link. This shows current superchargers in red, planned in grey
Visit a Store | Tesla Australia