I had a daily 5-mi-each-way commute on which I accumulated 13,000 miles without benefit of a suspension fork. Discomfort was the least of my worries! Even though some of the roads were rough, all I needed to do was rise momentarily out of the seat to accomodate steel plates, potholes, big waves of asphalt, etc. Usually this was on my mountain bike. But when I rode the road bike, I just did the same, only I would have to swerve around some stuff that would have given me a pinch flat or other trouble with the more delicate wheels.
To me it seems suspension for city riding is only added weight, and potential added trouble and expense.