I'd never push the call button unless there was some kind of dire emergency. If I need a drink I'll either hang on until the drink run or if I'm spitting feathers I'll have wander down the back and ask nicely. Often on a long flight there are other people just stretching their legs too and more than once I've struck up a short but meaningful friendship with other pax supping a can of coke in the galley!
BTW we remember the nice CC too, like the nice lady from Brit Air who asked me where I was off to next whilst waiting to depart the aircraft from Newcastle to CDG. When I answered 'Beirut' she was dead impressed. Can't see too many Geordies heading there that often!