I don't mind passengers coming into the galley for a small chat as long as it doesn't happen during the service! Galleys aren't the most spacious places and especially not when there are trolleys all over the place. It's also nice with a bit of privacy when you're having something to eat. I hate when passengers are standing in the galley and staring whilst you are eating. One trip when it usually gets far too crowded, but sometimes very nice too, is LAD with all of those oil rigger workers who come back to 4L and 4R to drink and socialise! It's also nice with a small chat in the middle of the night on a flight when half of the crew is on rest and you are bored to death and trying to keep yourself from falling asleep.