Now that I've seen that movie Chef, each time I see a food truck/cart I think of that chef guy and his foodie world. That was a good movie. Bet those guys are happy he's around with coffee and doughnuts first thing in the morning. :D
We don't really have coffee carts here, though the food trucks will usually have coffee.
There were lots of this sort of thing in NYC when we were there,and my husband jokingly said "if you can't find an item in NYC, you don't need it",because it seemed like there were vendors selling everything---cool culture though. I guess that's part of what makes IT NYC!!!!