Sneks eat a lot of rodents and various garden wreckers. Unless you live somewhere where they are poisonous and bitey, they are fine. Non-poisonous snakes far outnumber the poisonous ones.
I live in an area where we have these[1], and they're generally not something you see all that often. Their biggest danger isn't their venom (they're less venomous than the diamondback) so much as their curiosity, which can get them into locations they otherwise don't belong. They aren't overly aggressive snakes, and I've encountered them several times over the years.
Alon with bullsnakes, they're extremely useful for getting rid of said rodents—which CAN carry awful pathogens, like hanta virus!
I lived in NC for 6 months once. My boss at the time told me I'd need to watch out for copperheads in September when they come out. Indeed, I did have to shoo one off a bike path when September came.
It's August for us here in the SW US, but there's been construction in the area that has displaced a number of them at odd times of the year.
Fortunately, snakes will generally leave you alone unless they're provoked or cornered. Unfortunately, if you have curios animals (cats, dogs) it can be a much more significant problem!
there's a large amount of endangered and critically important species for which the strongest reason the general public accepts for why we should accommodate them is "they eat X in mosquitos every night"
The serious proposals to eliminate mosquitoes only propose to eliminate the mosquito species that carry nasty human diseases. If those species were eliminated other mosquito species would quickly expand to replace the eliminated species.
So that's good for the birds, and bad for the humans that want to get rid of all the pesky annoying mosquitoes, not just get rid of mosquito born disease.
Yes, all the ectoparasites, look it up. We've eliminated most endoparasites that used to live inside us. If we figure out how to, we should eliminate the ectos, including mosquitos.
As I understand it, scientists believe that lobsters are also functionally immortal, just not invulnerable. I think the problem is that after a while, it takes so many calories to continue molting, they simply can't hold enough in their bodies or something? Anyways, they don't have an old age problem like you'd expect.