I went last night and didn't see the advantage of FP. Since I'm just reading this tonight, I had no idea that FP existed for Fantasmic.
I was shocked when I got in line (fairly last minute) and CMs came up the line telling everyone it was for FP and dining package only. The line was the white line up the middle of the road and was stretched all the way to Hollywood Blvd.
They told us standby people to head up and get in line on the right. Turned out the line for me started all the way up past the entrance. It was way shorter than FP line and I walked right in with the line never stopping.
I couldn't help but think those poor FP and dining plan people were still a block away.