I find the same thing. My neighbors and I have chickens on ~5000 sq ft fenced lots and you barely notice them, especially when compared with the local bird and insect population. My neighbor has a rooster and even that isn't a large bother.
Ours only make noise when they are laying eggs. We have 4 in our pretty small yard and ours make quite a lot of noise when they are laying, but that only lasts a few minutes usually.