Having abandoned 9-5 to become a freelancer last year, I do the vast majority of my work (translation and copy writing/editing) at home, so I haven't really needed to use my car all that much. Just recently, I mustered the courage to ride further and into thicker traffic, which encouraged me to be even less car-dependent.
That said, however, there's no realistic way one can go entirely car-less in a place like Jeddah. Just yesterday, I had to go to a business meeting at King Abdulaziz University, which is about 30 kilometers from where I live. Given the roads, traffic, and the way people drive around here, it's just way too dangerous, time-consuming, and nerve-racking for me to cycle my way there and back.