I can totally relate to the OP, was in the same place myself until very recently. I have stayed at every level resort at WDW, from value to deluxe, even camped at FW for a week (BEAUTIFUL campgrounds). And of all the resorts my favorite was always the Poly. I LOVED the Polynesian, especially when my kids were little and we spent a lot of time in the MK. Loved the being on the MK monorail, convenience of the TTC in easy walking distance for the Epcot monorail, and the ambiance of the Poly just seemed perfect to me. A lagoon view with the castle always in sight, the concierge service, the friendliness of the CM's--what could be bettter?
Wellllll let me tell you what is better--at least to me. I own at BWV. I can walk to MGM and Epcot or take a nice boat ride. If I miss the thrill of the monorail I can walk through Epcot and hop on and take a monorail ride to the TTC and switch to the MK monorail (or the ferry if I'm in the mood) to the MK. With a one bedroom at BWV I have a HUGE room, much bigger than those I stayed in at the Poly, and we can spread out and not get in each other's faces so much.
We have our own Jacuzzi, a full kitchen, a washer/dryer, microwave, dvd/vcr, dishwasher--all the comforts of home. I save $$ by eating breakfast and lunch (we always take a midday break) in the room, and we have all our favorite foods there--better than concierge, because it's exactly what we want to eat, not what someone else decides to offer. Besides I got bored of concierge at the poly believe it or not--they rarely changed the menu AND to take advantage fully you have to be there when they serve. At DVC you do what you want at your own convenience.
Although the remoteness of the Poly is very relaxing, it's great to be at BWV and have the entire boardwalk at your feet to enjoy. There's always something to do if you desire, but if you don't there's plenty of space to relax in quieter areas of the resort. As for theming--Have you seen the lobby at BWV? Or the luna park pool? Definitely very cool and very Disney IMHO. I've never felt it was un-Disney like, quite the contrary. It's theming is different from the Poly, I will grant you that, but themed it is, like an Atlantic City Resort (or Coney Island) at the turn of the century.
Anyway no one could tell me otherwise and for years I did my thing at the Polynesian. I looked into DVC back then but my attitude was "If it's not on the monorail I am not interested". I guess I had to get it out of my system, I was so addicted to the Polynesian that we even got our walk around the world brick inscribed with the words "Poly Lovers" under our names.
But boy do I wish I could have some of that money back now! Even with an annual pass discount during value season the least expensive poly room (standard view non concierge) is $179 plus tax. And since I usually stayed lagoon view or lagoon and concierge, I paid up to $350/night--and that's with the discount due to the AP! I know I've seen others post the same thing but I'll say it too--If only I used that money towards DVC years ago!
I can still stay at the Poly if I want by renting out my DVC points and then paying cash with AP rates at the Poly, but I doubt I can ever go back to a regular size hotel room after experiencing a 1 Bedroom at BWV. I am not wealthy enough to afford a suite at the poly, that's about the only way I can see staying there now. I'll still visit, I love the kona cafe and 'ohana and the EWP is always fun to watch on the lagoon, as are the fireworks shooting off over the castle viewed from vantage point of the Poly beach.
Well this is turning into a novel. I'll just close by saying what everyone else has said and what it seems you are going to do--rent points, see how you feel. And then please come back and let us know what you decided and why.