To say there's nothing to do in HS currently is a lie! Shows take up a good portion of the day, so unless you just really hate shows, there's still plenty to do.
Beauty and the Beast - 20 minutes
Great Movie Ride - 22 minutes
Indiana Jones - 30 minutes
LMA Extreme Stunt Show - 30 minutes
Muppet Vision 3D - 17 minutes
Voyage of the Little Mermaid - 17 minutes
That's almost two and a half hours of stuff to do.
Again, unless you've been a gazillion times or you just don't like to watch shows, there's honestly just enough to do to make it a half-day park. Going to Hollywood Studios just by looking at the map, one should easily be able to see that the park mainly consists of shows, not rides. High capacity theaters that can take up time, not to mention the few attractions on top of that.
Going to Hollywood Studios and not wanting to see the shows is like going to Epcot and not wanting to see the countries.