the exotic driving experience park lets racing fans drive top-end cars .
gary terry , 36 , died in the crash and was on the passengers side .
tavon watson , 24-year-old hotel bellhop , was driving and was taken to hospital for treatment .
day at the racetrack was a gift from watson 's wife for his birthday .
disney world spokesman said driver ` lost control ' of the lamborghini .
family friend said working at disney attraction was a ` dream job ' for terry , a former race car driver from michigan .