Perhaps you need something a little more visual to help.
Double Beds at All-Star Sports (All the same size at the values.)
http://d2eu5panhhlmd4.cloudfront.net/wp-content/uploads/2012/06/.jpg
King-size bed at the values.
Double beds at a moderate (This one is from Port Orleans)
King-size bed at a moderate (This one's from Coronado Springs.)
Anyway, here are some things to consider and these I got from Mousesavers.com
Standard Room Area at a Value: 277 square feet
Standard Room Area at a Moderate: 314 square feet (Caribbean Beach though has theirs at 340 square feet!)
Caribbean Beach's Standard Rooms have two double beds (Just like the values.)
Standard rooms at Coronado Springs, Port Orleans- French Quarter and the Magnolia Bend section of Port Orleans-Riverside have two queen beds.
Standard rooms in the Alligator Bayou section of Port Orleans – Riverside have two Queen beds plus a small single Murphy bed.
So if I was in your position, I'd pick a moderate because you'll need a lot of space for a family of four and the values will definitely make you feel cramped! If you want a ton of room, then Coronado Springs, Port Orleans - Riverside or Port Orleans - French Quarter will work. Hope this helps!