Our last trip, we were in Rarotonga room 1806 (toward the middle, but closer to the GCH), facing the quiet pool. Our patio had little plant cover, but that did not impede our privacy (not crowded at any time) and we could still walk out to the quiet pool The room next door, 1807, had more foliage and did not have the same access to the pool. The Quiet Pool was never loud or crowded.
Our room was convenient, but still very quiet. We chose this longhouse primarily because we had guests with mobility issues and we wanted a longhouse that was centrally located to the bus stop, the temporary Captain Cook's at Tangaroa Terrace (no longer an issue) and not a far walk to the GCH. However, it was also a plus because it did not face the Volcano Pool (which has guests in it all night) and was not on the West side of the GCH (which we thought might have more foot traffic due to the Luau).
No matter your choice, you're still going to Disney and staying at the Poly. Enjoy all of it!