OK, let me give this a try...........it is hard for me as the FW Cabins are my family's favorite place on the face of this good Earth.
We used to stay at the FW Homes, now Cabins for many years. It was extremely easy when our two boys were young and in diapers, further, the kitchen made life all so easy when the youngn's want to be fed. The golf carts were basicaly their favorite ride at WDW, and the short boat ride over to Magic Kingdom made life alll so easy. It will always have that "warm" spot in our heart.
Well, year after year we went to FW, and the prices just crept up and up on the cabins. Well, I think it was year 2000, the price just sky rocketed ! (I think that was the year they finished the conversion from the FW Homes to the Cabins. That was it........it was no longer a cheap vacation, so we looked elsewhere, and concluded that buying
DVC made perfect economic sense for us. Now we had wished we had done it years earlier. So we split our purchase in 1/2 between VWL (a MK resort), and Boardwalk (a short walk to either MGM or EPCOT).
By now our boys were 9 and 7, and things had begun to change. First off, the DVC 1 BRs and up have a washer and dryer in them. It certainly beats bringing you laundry over to a FW Comfort Station. Second, is that DVC 1 BRs and up have a jacuzzi tub in them which is a plus. Now, I wish I had the actual square footage comparisons for you, but I couldn't find them. But my guess would be that a DVC 1BR is about the size of a FW cabin with a washer/dryer and jaccuzi added, and a HUGE bathroom/shower compared to a cabin. The kitchens are about the same size and equipment Plus VWL has all the amenities, service and comfort of all luxury resort. The only things that a FW Cabin has, that a DVC unit doesn't have is the outside BBQ grill and the 'by your unit' parking spot.
Now, in terms of transportation............I truely believe that the VWL has FW beat hands down as you have all the bus connections to MK, AK, MGM, and EPCOT right there without having to go to the transportation center. Unlike FW where you must do to the transportaion center. Both resorts have boat launch service, as you already are aware BUT, I am sure if you asked my boy's, they would probably tell you that they enjoyed taking the golf carts around even if it was to head to the bus stop or marina.
If you have any more questions just post and I will answer them.