While I understand what you're saying about the 'walk' to Epcot and DHS....you do realize that this is a selling point for these resorts, right?? There are boats that run to both Epcot and DHS from the S/D, or you can walk along the nice pathways to both parks.
And while I do understand the need to conserve money and to keep costs down, parking fees at the S/D are just the way it is. It really isn't right to try to park elsewhere, in a place you aren't entitled to park, in order to avoid that $15 a day cost.
When at the S/D, you are getting a much more deluxe room/resort experience than at other resorts in the area, for a lesser cost. A room at BW
or BC is going to be $385 a night, vs a room at the Dolphin at $159 a night. No, you don't get DME or the
ddp if at the S/D, but for a difference of over $200 a night??? I don't mind paying for transport or my food. And the parking fee isn't such a big deal.
In order to get that same rate at a WDW owned resort??? You need to book a moderate resort..then, you get to park free. But, you are talking about a whole different type resort now!! Not deluxe by any stretch of the imagination.
So, pay less to stay at a really nice resort, but pay addtl for parking.