I would. Folks in the park do not eat at regular times. So many are on their home time zone or are busy riding rides and get hungry at weird hours. It would not hur to make them just in case
I always make our PS when we go - it makes the planning more fun! But do you need to? Probably not unless you wanted to do a character meal or BB. Those I would stringly suggest making a PS for.
BTW - looks like you'll be there while we are! Awesome! You should go add your dates on the September Check-In thread!