Congratulations on what appears to be your first WDW trip - or at least with a family. If you are a first-timer, your experience won’t be a comparison trip. And if you go again in the future, it would be different as you travel with different aged children. Go without thinking of what you are missing - this might be what
Disneyland felt like when it first started
i looked at a website called
Undercover tourist; they have predictions of crowd size in the parks based on previous years’ numbers.
Your chosen time is low season (lots of places are low visitors those first two weeks in December). Especially good (low attendance) for Monday-Thursday, December 7-10. One day per park (currently, the option to pay more and visit more than one park in a day, “Park Hopping,” has been curtailed) would seem reasonable with small children. You might be able to skip EPCOT - I don’t know how children like that park. (There May be a section on this site for visiting with kids).
Unless you know this is a once in a lifetime trip, four days of parks should be plenty - and then expect to go back later and have a different experience with all the parades, character interactions, long lines, fireworks (Magic Kingdom, my favorite) — and tram rides from the parking lot to the gate (make sure you have the stroller). I think I will miss the tram more than anything at the end of a long day on asphalt as I trudge to the car.
I am planning for four or five days in mid September (low season) - a long trip for me; I often do 1-3 days at a time every couple of years or so (usually combined with a
Disney Cruise). I am hoping the low crowds and short wait times last at least for the next month.
Hope you have a great trip.