I rarely do squats, because I used to not trian legs. I do train them now and will try and incorporate sqauts more. To answer your question I beileve squats dont really do **** for your upper body. Benching increases test too and is a big strength building movement, but it doesnt build your legs.
I for one have built a big upper body and never did squats. But my legs need some good help, so squats here we go!