No, I've never actually 'needed' a drink but there are certainly times when I want one more than I usually do.
When I was a barmaid it used to make me laugh when people said stuff they had probably picked up on TV, like when people I had no recollection of serving, or had served several different drinks to over the months, would ask fo 'the usual' infront of their friends to try and make out the bar was like a home from home to them, and like you say, when people would say, 'make that a double, I need it' and then go on to tell me a far from convincing/interesting story of why they needed it