You can't pool hop to the Poly - only
DVC resorts, only those where it's allowed, and only if you are staying on points. NO ONE is allowed to swim at the Poly but guests who are staying there.
No. That's not totally correct.
True - pool hopping is only allowed when you are staying at a DVC resort using your points.
False - only DVC resorts. DVC members are allowed to hop to any WDW resort pool with the exception of SAB at BC/YC, AKL, and BLT pools. Hopping to the Poly would be fine. I'm not sure, but you may even be able to hop to Vero Beach. I've seen conflicting info on that, and never really looked into it further.
There are some dates during the year when pool hopping is not allowed, and the rules do say that pool areas that are at capacity may turn you away.
Edited to add:
Here's the exact wording from the Portable Perks I got when staying at BWV in early March -
When staying on your membership at Disney's Vero Beach Resort or any DVC resort at WDW, you and any guests staying with you are permitted to use most of the other DVC
and WDW Resort hotel pools (in addition to the pool at the resort at which you are staying) if they are not at capacity. If the pool you are visiting reaches capacity, you may be asked to leave to accommodate guests of that resort hotel. Please check with a host or hostess at the front desk of the resort you wish to visit before you go to check about pool-access availability. You must present your current Key to the World Card along with your Member ID card to use the other resort hotel pools.
Pool hopping is not available at Bay Cove Pool at BLT, Uzima Pool at AKL, SAB at BC/YC, and he leisure pool at BCV. There are no exceptions to this policy.
As a reminder, please be mindful of the limited number of pool chairs available, and refrain from leaving towels or other personal items on unoccupied pool chairs.
Blockout Dates:
Feb 20-26
Apr 16-30
May 27-30
Jun 6 - July 5
Sep 2-5
Nov 21-27
Dec 11 - Jan 1, 2012