if you have 2 weeks in Paris, then yes I would do a day trip.
Bare in mind though that the general park opening time is 10am, and that hotel guests will be inside for EMH from 8am.
I havent done it but alot of people on here and on another Disney forum have done a day trip, the train is very easy to manage and its abut 40 minutes journey time.
Also read up on the reality of
Disneyland Paris and people expectations of the park. I describe it as an American style theme park with the cultural and social aspect of France, basically Frenchified Disney. Dont expect the American Parks to be scooped up, made smaller and transported to France. Disneyland Paris is a very different experience to Disneyland California, both are unique in their own way. Disneyland Paris is the same but different. Walking down Main Street, it will feel similar and familiar but you will notice things are different