We are Epcot people, too!
Though our "home" is the Boardwalk.
We are DVC and tried the Polynesian villas a couple of years ago for one night. We found low priced flights to get us in a day early, and since BLT where we were staying for the following 9 nights was booked, we took the opportunity to try the Poly. Like you said, everyone talks about it and we just really wanted to give it a try.
Things we liked: ease of using the Monorail to get to MK and the other resorts, and being able to walk to the TTC for the Epcot Monorail instead of having to switch lines or use a bus. The experience of trying something new was also fun. The views of the Seven Seas Lagoon and boats going by, and MK in the distance, was really something!
Things we didn't like: First: the pool!! Oh my goodness, so completely crowded it was virtually impossible for our family to find chairs together. The pool bar does not refill the resort refillable mugs. You have to go all the way into Captain Cook's to get refills. It was a really hot day and our kids wanted their cold drinks, and going all the way over there are waiting for the refill machines with the folks who were in there eating was just not convenient.
The overall feel of the resort was much busier than we like. It's a rather popular place for people to visit who aren't staying there, so we found the lounges, and particularly trying to watch the MK fireworks outside very congested. Roaming around there at night is definitely not like roaming around Crescent Lake in the evening, even with the busy-ness of the Boardwalk at night!
I don't want to discourage you from trying it, because I am very glad we did. Of course, it was for only one night.
Would I stay there again? Yes. Is it near the top of my list? No.
We have done split stays many times, and they can be a bit of a pain, but they're a fun way to try new resorts without having to spend a whole trip there when you're not sure.
Good luck!