well it's always nice when someone comes to see you in the galley for a drink but otherwise i would say the call bell thats why it's there, plus i would rather pax felt that they could use it, then if there is a real problem like a medical emergency they will naturally use it to get one of us. All too often pax that feel unwell and could have something seriously wrong feel that they shouldn't use the bell and it's the pax sitting near to them that alert us by pressing the bell, because the pax infront has keeled over!