The QSRs at DLP - keeping in mind my last trip was pre-pandemic - were all very generic and mid-to-low tier basic burgers, fries, etc. Every QSR served the exact same menu. I asked for the salad and well, that was a mistake. We saw tomato basil soup on the menu and thought, yum, but it was a packet of dry soup mix made with the hot water from the coffee machine. Which is different to DLR or WDW, and in sharp contrast to the street food in Paris where I find even the sandwiches sold off carts in the tourist areas to be delicious. Plus the crepes stands, the falafel in the Marais - yum!
The sit down restaurants at DLP resorts are better - one of the best meals I’ve ever had was at the now gone California Grill at the Disneyland Hotel - but I found the sit down restaurants in the park disappointing both in comparison to their counterparts at the American theme parks, restaurants in Paris, and also not as excellent as my first visit in 2000. I’d reserve that time and money for a meal in the city rather than using your time at DLP - unless you want the experience. I find table service meals in Europe to be far more civilized - you aren’t rushed to turn tables and service is on your terms without the server constantly interrupting, but if you have only so much time at DLP you might want to spend it exploring the parks. Disneyland Paris is very pretty at night - it’s just a gorgeous park in general.
Also, general tip for France - when you enter an establishment, always greet the people working there with bonjour or bon soir, depending on time of day, and always say au revoir as you leave. Learning some French and using it can go far.
Social media is going to exaggerate the ills - that’s what gets engagement, after all, and makes money for the content generator ;-) The Metro and RER are used daily by most of the general public; it’s not a car culture the way CA is plus traffic can get congested making the Metro more convenient and faster. I will say I had to twist the arm of my then boyfriend, now husband, to go to Paris on his first trip - he had heard terrible things about the city. Now it’s his favorite place on the planet. But nothing worse than being stressed on vacation if you are worried about public transport or are unfamiliar with using it! You can look into car services but unfortunately I don’t have one to recommend.
The next stop on the RER from Disneyland Paris - a five minute ride - is
Val d’Europe which has a shopping mall and an Auchan hypermarche (a supermarket on steroids). The mall will feel very familiar in layout to US malls with a mix of US, French, UK, and European chains. We love French supermarkets in every form and when we go to DLP we stop at Auchan for snacks (and wine for the hotel room) instead of eating park food. French charcuterie, cheese, chocolate and bread - I’m drooling as I type.
There is a bus shuttle at DLP that takes you round trip from the train station to the hotels and from the hotels to the parks but I don’t know of any other shuttle that has stops.