Disney do inform people how to travel between places.
Back when paper was more of a thing than the internet, we got a leaflet upon check-in at our resort which did exactly that. Even down to the fact that the best mode of transport between two resort hotels is via Disney Springs (or Downtown Disney as it was back then).
Nowadays they use the MDE app instead of giving out so much paper, but there is also information on the website.
from
https://www.disneyworld.co.uk/guest-services/bus-transportation/
"
Getting Between Different Disney Theme Parks, Water Parks and Resort Hotels
Please tap “Get Directions” in the My Disney Experience app or ask a Cast Member to assist you in planning your trip from one park to another. The most direct route may involve a combination of bus, monorail, boat or walking."
There is also a whole page on transport
https://www.disneyworld.co.uk/guest-services/resort-transportation/
But they tell the resort guests how to travel to/from their resort. There is no need to tell every single guest at a restaurant how to do it.
Also as already noted this is only really an issue at Animal Kingdom Lodge where the nearest parks close early. Dine at the Contempory and you will more than likely be able to walk to the Magic Kingdom and get a bus to your resort as the MK is open much later and (as shown on the above-mentioned webpage) bus service continues an hour after park closing.