The thing about Paris Disney is that it is well away from any other facilities. So it has site-based hotels and restaurants, which are super-convenient for the theme park. We had an excellent family room at the santa Fe some years ago.
Refreshments are disproportionately dear, but one way round this is to have a bed and buffet breakfast and - discreetly make sandwiches for handbag. ahem.
i think those stories hubbie has been told are broadly true - stuff that you would call bar snacks is very expensive, as is alcohol. There used to be a petrol station that did a roaring trade in booze, don't know if its still there.
if you do the maths your package is working out about £40 each a night (hopefully with breakfast) including theme park tickets, and being right on site with the santa fe, it should suit yor needs.
Make sure you have your route, and costs bt hotel and airport sorted out now is the time to check which Paris airport you are using.