Well, are these venoms of the snakes and lizards actually extremely effective? Like the Gilas and Beadeds causing you extreme pain when they inject their venom in, like the snakes in South America that can kill you pretty quickly once the venom is injected?

Hognose's venom is not very potent. I hear it can get as bad as a Copperhead bite, but I also hear that's rare. Boomslangs are a different story, I still don't see how they are considered a colubrid instead of an elapid.