Well the wife and I just drove there for a few days over the holiday break and I can tell you it wasn't much fun. The motorcyclists splitting lanes were really un-nerving. But if Parisians want more people to use the rail system they'd do very well to add other languages to the ticket machines.
Overall my only real confusion centered around these road signs depicting a burning/exploding car. I wasn't sure if I was supposed to pull over and light my car on fire or if we were entering a "lighting car on fire forbidden zone".
... I may never know.