I believe you can actually walk to the Poly almost as fast as the Monorail can get you there. WE always walk to Kona after parking at the TTC.
WE never get PS for Kona, and most times we walk right on in. Once in awhile a few minutes wait, but nothing major.
Would agree tho that if you know exactly when you'll be getting there to eat, no harm at all in making PS.