I just stayed at the Hilton last week and can verify that you do in fact get package delivery as I used it. When you ask a CM, they may not know, but when they fill out the standard form for package delivery, the Hilton is definitely one of the hotels you can check off.
We also used the Extra Magic Hour at the Magic Kingdom. We drove ourselves to the TTC, and there was a CM at the monorail. We just had to show our Hilton room key in order to board the monorail at that time.
Also purchased e-night ticket there.
Can't say for sure about free parking as we had AP's, so our parking was free, but I don't believe that parking is free.
For our $60 Priceline rate, we loved the Hilton. Spent 4 nights at Pleasure Island and it was sure nice to be able to walk back to the hotel.