Just got back from SWW. It WAS mobbed!! As we were leaving. We got there to MGM at 9:05 for a 9:00 opening. We got to see Vader, the Emperor, Chewbacca, Jedi Mickey, a couple other characters, hit the store, and see the movie. We were done by 11:30.
Most of the crowd in the morning was at SWW, so I would figure RnR and ToT had minimal waits.
It's like anything else at Disney... Go early. Nap hard. Play late.