I had some of your concerns before staying at S/D so here's my take:
At S/D you can see and walk to MGM, Epcot and Boardwalk, it doesn't get more 'Disney' than that. Dolphin has Tubbi's, a cafeteria style eatery for fast meals at as reasonable a price as can be expected. I prefer neither place over the other, but my wife claims Swan is superior. Each has it's own bus stop on the same WDW transport system as any 'official' Disney resort, but the same bus stops at both, as in PO/Riverside & FQ, and during slow times that bus will also hit YC, BC and BW. As you can see, we're staying at both soon, and I'd drop AllStar and add 2 days to either S/D if I could get the Teacher's Rate there. There's no lack of Disney atmosphere here.
Bill From PA