Earlier quoted context omitted.
Mosquitoes, I'll grant you, even though they're a significant prey source for dragonflies. But wasps? You should be thanking them for the fact you still have trees, with the way they keep bagworms and tent caterpillars down. Flowers, too, for quite a lot of which they're the major or even the only pollinators.
I don't know. I had a hornet nest in my garden last year. They make a bit of a mess and you shouldn't go to near to their nest, but they are awesome insects and far better than wasps. They also eat them so you won't find that many flying around. They are just the larger, more peaceful versions that somehow aren't interested in humans the slightest. Sadly, they move every year and this time around the wasps are back.
I'm careful to approach only lone foragers and not nests, and I have yet to be stung while taking pictures of any wasp, something I typically do from as close to my macro lens's six-inch minimum working distance as I can manage - usually within 12 inches (30cm). Hornet, yellowjacket, paper wasp, or solitary, they all seem about equally willing to leave me unbothered, so long as I don't bother them first. Happily, having a camera lens and flashes going off nearby doesn't seem to count as bothering!