What is the spider and creepey crawley concentration like here?

no worse than anywhere else. keep your property neat and tidy to reduce the risk

Depending on an area and a property.
As 2 polarities - You will get more spiders if you adjacent to the National Park and your backyard is overgrown with leafy trees and not cleared up regularly. On another hand – you will rarely see any in a more urban areas and in a city.

For majority of properties that fall in a middle it’s not an issue really. If you worry – you can always get pest treatment.