Never seen one in my backyard, but bring the kids to school 10 min away in Falmouth and their preschool had a bunch in their oaks. So that trace to moderate from Portland to Falmouth lines up.
My in laws had a huge problem this year at the lake house. They found the cherry trees on the streets and everyone came home from their first visit with rashes all over. They had the trees removed over a week ago but the suckers were still crawling around last week trying to find a place to settle down.
If you are sensitive enough to them and inhale the hairs from a big infestation you can have breathing difficulty. So they warn you not to chuck a fan in the window at night (great news for the AC lovers out there).