SSR....We're SSR owners. We've been to WDW Thanksgiving week for the past three years. We were able to switch to VWL in 2005 and 2006, but we were one night short of being able to make the switch this year. SSR was terrific, we had our car, but found the buses to be no worse than any other resort. The resort is very tastefully decorated and the close proximity to DTD is great. Be sure and try the Thanksgiving special sandwich at Earl of Sandwich (turkey with dressing and a cranberry sauce dressing -- out of this world, and offered well past Thanksgiving Day).
Parks......For our family, the single biggest can't miss (and worth the 700 mile drive from NC alone) is the Osborne lights over in MGM (er, Disney Hollywood Studios). The decorations throughout the all of the parks are spectacular. If time allows, take the monorail tour and check out the decorations in the lobbies of the monorail resorts (Grand Floridian has a "life-size" ginger bread house, life-size choclate carvings of Pinnocchio and Geppetto). Take a bus over to the Boardwalk area (a carved chocolate carousel), then walk or boat to EPCOT or MGM and catch a bus back to SSR. We've never done the Candlelight Processional in EPCOT, but some say it is their favorite holiday event. And....oh yeah, the lighting on the castle this year was beautiful, I hope they keep it as new Christmas tradition. And don't forget the lobby at the Wilderness Lodge -- it's remarkable anytime, but that towering tree is unforgettable.
Crowds.....It can be very crowded, but presumably, you're a regular reader of these boards and with the knowledge you have -- and the fact that as
DVC'ers you'll be going back, the crowds are basically a non-issue IMHO. Is it better/easier to go the first week of December? You bet -- but as a Disney veteran, I would never let the Thanksgiving crowds scare me away.
Tour Guide Mike.....Honestly, his generic touring advice doesn't contain one thing that you can't find/haven't seen on the internet (or this board alone). THAT SAID, his advice on WHICH park to choose for which day is well worth the price. We did the first two Thanksgiving's without TGM, and it was very manageable -- but following his advice on which park honestly made us almost forget it was Thanksgiving this past year. I don't think this Thanksgiving was substantially less crowded than past two Thanksgivings (I'm sure someone has posted info regarding park closings during that week), but the results have already convinced us to sign up with TGM for our upcoming trip over Spring Break (which thankfully falls after the two weeks of Easter for us this year).
Good luck, You are sure to have a magical time.