The huge station that is many people's first impression of Disneyland Paris is actually quite OK as…read morestations go. It's very spacious and well lit (being mostly glass!). It can get a bit busy on the platforms or by the entrance exit gates to the trains, at the peak times, but people soon disperse.
Is served most notably by the Eurostar and the very useful RER A which runs across Paris, but also but my numerous TGV services which I simply cannot be bothered to look up.
There are a few little shops and kiosks dotted around which, while overpriced, can be a good place to stock up on snacks and drinks before going into the park, where food is naturally even more expensive.