I think 7DMT will have a queue around it's perimeter. I'm guessing they'll go counter-clockwise when looking at an aerial view, so as to avoid the bridge area if at all possible.
The "S" curves are really going to make the swaying motion pronounced on some part of the track. I would figure that Disney has patented it, but it is so novel that I think a lot of people will come just to have that experience.
Imagine going on BTMRR, or the Matterhorn, in a ride vehicle that also sways side to side . . . I think it would up the thrill factor another degree.
I think that if 7DMT had something like 8 show scenes, telling the story of Snow White, with all the thrills, it would be as popular as Splash, if not the most popular attraction in the park. As is, I think it will still be pretty popular, it has a thrill you can't get on BTMRR, Space, or really another other coaster. People are used to going at high speeds in a car, even accelerating/de-accelerating, in a forwards/backwards direction, but adding on the sideways motion, and I'm guess it will feel like you're going to fly out of the mine car, way better than just a "goat trick."