Traffic isn't too bad. The Metro and train systems work really well. Fresh-squeezed grapefruit juice at breakfast is apparently a basic human right. The croissants are soft and flaky and buttery, like croissants are supposed to be, but almost never are anywhere else. Good food can be had. People are generally kinda nice. Lots of pretty old buildings.
Too many people still haven't figured out that they could be even more glamorous if they didn't smoke. There's only one channel (BBC World) in English, and it repeats every 30 minutes. The food is different enough to complicate things, and some of it is just kinda gross to think about (foie gras, anyone?).
So, overall, Paris seems a nice place to visit, and even a nice place to be very very busy. I'm not sure what I'd do if I had a lot of free time, though. :)