We just returned from the 7 day western cruise and they had a matinee showing of Disney Dreams at 2pm. ( I think that was on the 1st day at sea)
They did not have a matinee showing of Hercules though...I know because we missed that show.
They also had a matinee showing of the big movie that week "Hidalgo" in the Walt Disney Theater.
I don't believe they had any other matinee showings that week.
Hope this helps