First of all, congrats on booking the Polynesian!

It's my family's favorite WDW resort! Don't worry about feeling like the Clampetts, like Cara said, the Polynesian is a very relaxed and laid back resort, you feel very comfortable once you step inside the lobby, and everyone that I've ever encountered there has been VERY friendly and helpful.
JanB gave you some great tips and advice about some of the differences you'll find at a deluxe resort, so I'll add just a few:
The main thing that I personally love about the Polynesian resort is that even when you're at your resort you still feel as though you're still in the middle of the "Disney magic". You can SEE the castle from the volcano pool, and from the beaches, and from many of the rooms. The theming is done very well. You have the boat AND monorail transportation to the MK, and the TTC is right next door to the Polynesian (there's even a path through the Polynesian which leads right to the TTC!), and you can get the monorail over to Epct.
There's nothing like being at the MK and looking over and knowing that your resort is RIGHT THERE, just a quick anf fun boat or monoral ride away.
You will get more toiletries at a deluxe resort than you'll get at a value or moderate. For example, the moderates have a combination shampoo/conditioner, while the deluxe resorts have a separate shampoo and conditioner, as well as lotion and shower gel. They've recently upgraded the brand and quality of the toiletries, so now I don't pack any of my own shampoo or conditioner anymore, since the new quality is very good.
If you have any specific questions, please post them. And have a wonderful time at the Polynesian!
