Watching this movie in 3-D IMAX never gets old, and the extended scenes were fun to spot out while watching the movie. Although they were mostly scenic flavor scenes with little meaning, who is going to complain about seeing more of the beautiful Pandoran environment, and the animals that inhabit it.
See it again in 3-D IMAX while you still have the chance, and if you've never experienced it in IMAX, what are you waiting for? The difference in the aural experience alone is worth it.