There is also a part in the show where they select 4-5 kids from each section to come dance with the cast. These are chosen from those in the first couple of rows in each section. If you have kids aged 4-7ish that might want to participate, having a FP is pretty much required as that's the only way you'll be able to sit in those rows.

If that doesn't apply, and you don't have to be as close as possible to enjoy a show, then FP isn't really necessary.

Steve