I think it would help. Sure, you can enjoy the land without seeing the movie the same way you can enjoy any immersive environment. Flight of Passage will be a fun, Soaring-type ride. Navi River will be a slow, boat ride with a strange-looking animatronic at the end. Similarly, you could go to Magic Kingdom without ever seeing any Disney movie. But, if you see the movie, you'll have a better sense of what the imagineers created with Pandora. You'll have a greater appreciation for the land, and you'll understand what is being discussed when you hear Na'vi, banshees, and toruk.