doctor visit

Today I went to the doctors for a check up. I walk into the waiting room and I am greeted by all the waiting patients. I am startled by all the gruß gotts I am getting. I look down at the floor and say gruß gott softly, I don't think anyone heard me but who was I supposed to direct my greeting to anyway? A woman leaves and the chorus sings, "Aufwiedersehen!" I say Aufwiedersehen uncomfortably to myself, no one can hear me. These are the only words said in the waiting room. An introduction and a conclusion but no body. Whats the point? In NYC you just don't acknowledge anyone and if you do say hello usually a conversation follows.