If I remember correctly, they did show movies in one of the lounges, but you can also catch some on the TV in your cabin, but be sure to venture out and see the ports and the ship, just a lovely ship, enjoy.
They show movies in the Vista Lounge on the Grand (probably the same on the Golden) but not everyday, but there were lots on movies on the TV. I looked into the vista lounge when "Ocean's Eleven" was playing - hardly anyone there. Too much else to do on the ship.
The movies were shown in the Princess Theatre when there were no shows on.
The only trouble was the screen was too dark and this definitely spoiled our enjoyment of Spiderman but we were there in the afternoon and had a good sleep instead!
All the ships show movies, usually in the Princess Theatre. On our last cruise they showed movies in the late afternoon (3 or 4:00) and then a different movie late at night, around 11:00 PM. The next morning these same movies would magically appear on the TV in the cabin and be played over and over and over again. I agree with the other responses though, don't sit in a movie theatre when you could be enjoying the beautiful ports and ship. Cruznliz