I see it another way. I think the day guest is getting a raw deal. They pay for a full day to park closes, and then the party people are let in 2 hours early!!! I have been that day guest and didn't know disney did this. It was awful for us to try to enjoy our paid for last 2 hours. The rides were over an hour wait and trying to walk around MK was dangerous. It was shoulder to shoulder. We didn't "linger" but got out of there ! So when you enter early you might have to put up with those pesky day guests for a while. I know I will never go to a park on party days anymore. Not worth the wait, the hassle, and the money paid for that day, IMO>
I think disney should make it party hours as stated, with NO early entry. That way, it would be fair to everyone. You get the party hours you paid for and the day guests get the hours they paid for without the humungus crowds. I know disney doesn't care about the day guests, but it still irritates me.
Sorry to unload on you but it is a sore point when it sounds like a party person doesn't like the day guests to linger.....