In the video, linked below, Car and Driver reviews the Tesla Model S. Some of the things that blow my mind for it is that it does NOT have a radiator, technically it is a 7 seater car, and there is no lag in throttle response! With traditional gas vehicles there is some hesitation, even if it is small, but according to Csaba Csere there is no hesitation. You hit that throttle and you Go!
Now to explain the 7 seater comment, there is an optional third row adding 2 seats that are designed for childen under 77lbs. And to explain the other statement, there is a small cooling system to keep the battery at ideal temperature, but that is no comparison to the size of a radiator and coolant system in a traditional car.
See the Review: http://www.youtube.com/watch?v=1kCG-WqpVnI