I lived on a mountain near Healesville for about 18 months and over the two summers there saw about 8 snakes. Tigers, browns and one copperhead. The biggest was a tiger snake about 6 feet long, saw that on a hot day near the chook shed. IT ran from me. The copperhead was in a telstra pit and was being a bit territorial so that reared up nicely letting me know to keep my distance- which I was quite happy to.
Last year I took my kids to the Steiner Fair in Warranwood which is pretty good value and there was a snake dude there. He brought a few snakes out of his box and a crowd of about 50 people watched them squirming around in the sun while he explained how indifferent they are to us. Most can't even see us, especially when they are on the ground where they are at their fastest. When they rear up, ready to strike.. only half of their 'legs' are on the ground so they can't really chase anyone who can move away any quicker than a moderate crawling pace. They don't want to eat us so unless we accidentally step on them or deliberately start poking them or something stupid like that there's plenty of room for all of us.
The main thing to remember is not to lose your cool and panic.. if you see one at a distance enjoy the view. If you don't see it till it gets close, stand still till you see what the snake is doing or which way it's moving, then slowly move away... then enjoy the view.
And if you have kids, call them over. Don't let them grow up scared like we have.. let them get used to being around them every chance you get. Teach them to respect the snake and keep their distance- but not to fear it.
You forgot leeches, ticks and especially scorpions.. I've seen them while camping and am much more scared of them than snakes.. which is to say just a tiny bit scared.