It was coincidental that the morning I read your post, a friend wanted to go to the studios and the line for Great Movie Ride was very short. It was hard to find. There is a barber shop in the western section of the ride and a small sign hanging advertises the dentist's name.
THANKS!!! it must be so nice to be able to pick up and head to WDW whenever you want - it's been 6 years for me and i'm feeling the pain! Thankfully the Red Sox have given me something else to focus on - for a few days, anyway.