I think the 1996 Fiesta Bowl was the last time too.
I remember Sports Illustrated talking about how Florida's Speed was going to be too much for Nebraska and how Nebraska was going to get blown out of the water. SI would have predicted the 62-24 would have been advantage to Florida. Since then, MAYBE the Notre Dame game in 2000 because if I remember correctly, some folks said Nebraska couldn't pull off a win at Notre Dame.
What about against Oklahoma in 2001? I thought we were the underdogs in that one by 10 points or so.