We are also interested in people's responses to this question--but to get us started, here's what we've done (we traditionally do T-giving at WDW):
The best (by far) so far has been California Grilll...fantastic! But not sure it's a perfect choice (due to "elegance" as well as cost) for a family w/three little ones in tow...
The CS T-giving turkey dinner (w/all the trimmings) at Artist's Palette at SSR was wonderful, and not too expensive ($10 each as I recall)...
One year we had steaks at the Steak House at the Swolphin (it's early in the morning and my brain isn't cooperating...just can't remember the name...it's one of the fancy chain steak houses tho)...the rest of the family LOVED it; I wanted turkey, tho, so altho I thought the meal was wonderful, it just wasn't T-giving dinner for me...that was the year we discovered the CS turkey meal at AP, tho, so it all worked out well in the end...
Another good choice (for us) was the Garden Grill at the Land in Epcot...DELICIOUS...and since it was family-style, it felt a bit more "T-giving-y"...
And this thread reminds me that it's getting close to the time to make ADRs...I guess I'd better decide for this year myself!