Why is cocaine used?

Cocaine is one narcotic that still has some medicinal applications. It is often used for both nose and eye surgery, because of its numbing affect. It is still a popular recreational drug although it has lost alot of its appeal due to cost and the relatively short term of its effects. To the best of my knowledge is mostly used to compliment heroine in a mixture called a speedball.
It is used mostly to give a short term burst of energy, accompanied by a feeling of euphoria.