As I was working in Puteaux, and trainning in the evening in the Bois de Vincennes, My route was taking me through the place de l'etoile as well, but there is two road that circle around it, rue de presbourg and rue de tilsit. You get lots of traffic lights but but your chances of staying alive are (slightly) better.
As for scooters, mine was stolen on a pavement, in front of a police station. :-(
The great thing in paris is that whith a scooter or a bike, you can really park withint two foot of your destination, not like in london where it is even harder to park a bike than it is to park a car.