Compared to DLR, WDW is more of a "slow burn" type of theme park experience. You allocate more days to the trip, and you pace yourself. You know it will take longer, but you will get to do more and see more than you possibly could at DLR. With four theme parks and two water parks, WDW has many more quality attractions than the east coast resort. It just takes longer to get to them all.
DLR is a more concentrated experience. The parks are right next door to each other, and Disneyland has a lot of rides and shows packed in a surprisingly small area. But DLR will seldom be the linchpin of someone's entire vaction. Much more often, it's a part of a larger California vacation. By contrast, many people will build their entire vacation around WDW -- with maybe one or two additional days for Universal or Sea World.
I happen to love both kinds of trips. But hey, that's just me. Maybe next time at WDW (which happens to be next month!) I should spend my entire trip comparing the parks to Disneyland, instead of relaxing and having fun?