Australia not only has the highly venomous snakes, but aren't they highly aggressive ones too? That's a dangerous combination.
Africa's got some pretty venomous snakes too, but I can only think of one off the top of my head that gets the highly aggressive label as well - the Black Mamba. The Puff Adder? It's quite venomous, but I don't know about the aggressive part. India has the Russell's Viper - not quite as super venomous (but still bad), however it's high on the aggressive list. Also the King Cobra, but I don't know if that one is considered super aggressive (maybe just big and highly venomous).
I don't think the Americas or Europe have anything close to these bad-ass snakes. Australia, Africa and southern Asia seem to have come out on the short end of the bad snake deal.
Australia doesn't just have the snakes. They have monster crocodiles. Killer jellyfish. Great White sharks. Even their birds are dangerous (the Cassowary can go after you like a velociraptor, can't it?) I was a nervous dad when my daughter did "study abroad" in Tasmania, since she really likes exploring out of the way places. But doesn't Tasmania have slightly more cuddly animals than the rest of Australia?