In all honesty, I think the ride is over-rated and the line is usually too long. The issue I have with the ride is that the 3D sometimes becomes blurry/out of focus and therefore takes you out of the immersion. (Also, my 3D glasses were too big for my head and kept sliding off, which was concerning. They may have fixed this though, I don't know.) The best scenes were the ones happening in the dark, like in the caves, etc., because the blurriness wasn't as noticeable.
That said, I think it is really great, fun, exhilarating and all that. The parts where the Banshee dives were really thrilling and gave you the sensation of a free fall that was really surprising and cool. I have only ever had a FP so I cannot speak for the SB line queue's supposedly excellent design. The pre-show stuff is pretty cute, if not a little corny. It's an excellent ride, but not perfectly amazing as some reviews (and the Stand-by line) would leave you to believe.
I would say you should try your best not to miss it, but don't become depressed if it doesn't fit into the schedule. Animal Kingdom was already an excellent park even without Pandora and you'll still have a great time, even if you miss FoP.