Frankly, I don't see the observer as necessarily affecting the observed here in the macro world either -- only in the philosophical realm of changing knowing everything about the observed.
I gather most physicists are just so happy that it "works" that they don't care about why it works. It's a kind of "don't ask, don't tell" kinda thing.... :^)
BTW, I like RightWhale's answer to my question. It makes simple sense to my particularly simple mind. But where there are aberrations in the behavior of quanta, relative to big stuff, don't tell the Supreme Court about it, they'll find a compelling interest in it, under the penumbra of where the sun don't shine.