I worked there a decade or so ago when the new off-site hotels in places like Magny-le-Hongre were being built. That’s not too long a bus ride away if it makes it significantly cheaper. You’d probably still want to get a bus from the cheaper disney hotels anyway as they’re a fair few minutes walk out from the park.
I’d echo what clubber says about food – it was about £4 a pint when I was there, god knows how much it is now!
If you want to stay in Paris it’s 40 minutes on the RER from Chatelet-les-Halles, direct to the gates of the park.