I was intending to reply saying that it's not something that we're constantly, or really ever, on alert for, primarily because I live in suburbia.
However, and I don't think this is entirely representative, we live across the road from a gully (and the other side of the gully is a big main road, we're not out in the sticks or anything) and a couple of our neighbours have seen brown snakes in their backyards. Brown snake may be a boring name, but they're no joke [0]. One neighbor lost a dog to a brown snake, and have since moved because of that.
Thankfully, we've never seen one in our yard. We do have a couple of blue tongue lizards though, but they're beautiful[1].
Coincidentally, my daughter, right just now while I was writing this, pointed out a huntsman spider on the outside of the kitchen window[2] - don't often see them out and about in winter.
Seriously though, these animals don't factor in to the average Australian's daily life - even as a parent. The mortgage and school and sport fees, they're the universal killers.
[0]: https://en.m.wikipedia.org/wiki/Eastern_brown_snake
[1]: https://en.m.wikipedia.org/wiki/Blue-tongued_skink
[2]: https://imgur.com/gallery/aWwz3zx