For what it's worth, the WDW resorts have clamped down pretty hard on parking. Unless you are (a) a registered guest or (b) have a dining reservation, you won't get past the gates. They no longer allow folks to park for a counter service meal, to shop, or "just look around."
At the same time, there are reports that they are starting to check resort status around the pools, including at the Poly. Maybe they could do that more often, but still---its not like they are not trying at all.
But there is no convenient way to keep people from visiting the public spaces in the resort via monoral, boat, or just walking over from the TTC without making things very *in*convenient for everyone---including the resort guests going back and forth.
The TouringPlans surveys have the Poly fairly solidly in the middle of the pack for guest satisfaction---not great, but not terrible, and comparable to some others that Everyone Loves (see BC/BCV for example). The Villas and Resort are rated separately, and the Villas have a noticeably lower repeatability score, but that might say more about
DVC members than the villas vs. the resort, as this was 2024, mostly before the Tower was in play.
https://touringplans.com/blog/2024-awards-best-of-disney-world-resorts/