This must mean that the people who created cars must run pretty fast.

Computers have a very fast raw processing power. The fact that someone comes up with an algorithm does not mean that he can run it in his head at the same speed as a computer would. For that reason, the computer might be able to do much more (in our timescale) than the human who created it. If you don't believe me, go to Matlab and ask it to graph some complicated function.

I'm not denying that computer programmers cannot come close to replicating a human being's creative process at this point. However, I don't see a priori reason as to why this will always bee impossible, as you seem to suggest. I think creativity is just a set of processes that we don't understand... yet.