Hi French_Mystique, I am surprised and interested by your last comment as we have used one day Mobilis tickets or Paris Visite cards and caught the last train from Chatelet Les Halles at midnight, arriving at MLV around 00.40. We had no problem leaving Chessy station. Were we just lucky?
Hi Chris, as skimom says if you can see the TQ lists on both our MLV and DLP forums pages there is one about visiting Paris from Disneyland by train or coach trip. It is very easy as the RER A train goes from MLV Chessy / Disneyland to central Paris and beyond with no need to change. It takes approx 40 mins to Chatelet Les Halles (Notre Dame area) and a bit longer to CDG Etoile for the Arc de Triomphe and line 6 Metro from there to the Eiffel Tower. (Trocadero or Bir Hakeim stops).
We also use some good guide books like the AA one, and plan what we are going to do in our day each time we visit Paris from DLP. If you catch an early train is it surprising how much you can fit in if you do some research and plan before you go. Both the Mobilis and Paris Visite cover RER, buses and Metro in Paris. Alternatively you could buy two singles for slightly less, (children aged 4-11 travel half price) and use the Hop On Hop Off tour bus in Paris to get around instead if you find that easier. They don't sell a 1 day ticket though, so you have to buy a 2 day one.
Don't worry about not speaking French, as many people speak English, but as we have said in other threads it is useful and polite if you know how to say please, thank you, hello etc. See this page -
about-france.com/tourism/french-phrases.htm
http://www.carsrouges.com/