I was worried about this too, but my group wasn't as interested in parades as I was & didn't want to waste a FP on one. I dashed from tomorrowland to Main Street for festival of fantasy parade and had a spot right behind the curb - only one row in front of us, arriving just 10-15 min before the parade. Still lots of places to easily see it from Frontierland too. I've heard rave reviews about the parade FP, a little more mixed about the fireworks one, but you can easily still see them without.