Can you say mob scene. We were there last 4th. No there is not an area set aside for Polynesian guests. Yes, they check ID's at the front security gate. If you have a PS for dinner and are driving then you will get a 3 hour parking pass, Yes they were towing cars after the 3 hours expire, so plan accordingly. Your name must be on the PS list to get in the gate.
As Tikiman said though they can't check ID's for those that came over on the monorail or ferry as closely as those that drive in. They do spot check on the beach.
I know they are considering some alternative plans for the future due to guest complaints. They are also considering a credit card deposit on any PS for that day.
Some people just went up to other people's rooms and took their patio chairs. There was almost as fight as the guest came to claim them, they had to get a CM to intervene.