We have stayed on the monorail, at the AKL, WL and the Epcot resort area. Our Ds is now 7 years old.
The deluxe I feel offers the most is the YC/BC. Just because your kids are 2 and 4 doesn't mean you will spend all of your time at the MK. As the parents, we decided that our son would go to all of the parks and he has always enjoyed them all.
Here is why I LOVE this resort:
Beautiful, luxurious theming
spacious rooms with mini bars
Large selection of restaurants
BEST pool on property- there is huge, shallow beach area and TWO water slides-a smaller one and the big one, 3 hot tubs, lazy river.....
BEST character breakfast at Cape May (they have Krispy Kreme's!)
Boat to MGM, Boardwalk, Epcot
You can easily walk to the Boardwalk and Epcot
#1 REASON-LOCATION
The practical side of things:
Here is where LOCATION really comes into play. In the morning, when we are fresh, we don't mind taking a bus to MK or AK (or boat to MGM for that matter). In the evenings, it's SOOOOOOOOOO nice to just put the kids in the strollers and meander over to Epcot or the Boardwalk, without messing around with transportation. Our son was always happy to do the slower paced attractions at Epcot in the evening and just happy to sit in his stroller as we enjoyed the World Showcase. If you want a character dinner-try the Garden Grill!!!
We stayed at the Poly this last trip and although it was really nice, we did miss the Epcot area at night....
That's why we are heading to the BWI for Thanksgiving!!!!