World of Disney and Days of Christmas are two of my favorite stores in all of DW. Plus Wolfgang Puck Express is our favorite CS. Having said that I don't think you need more than a couple of hours there. We don't even bother with Pleasure Island, we stay in Marketplace. We always go there our arrival day because we usually don't get in until 3pm or so and after driving all day we don't feel like going to the parks.
Oh yeah, I forgot about the Design a Tee store. We searched all over the parks for a Tigger t shirt for my DS's girlfriend last trip without any luck. We went into this store picked up an orange Tshirt (her favorite color) in her size, picked out a Tigger design and in a few minutes had the tshirt she requested.