I personally would pick WL - as Paula said above, the boats are easy (every other boat typically can accommodate an
ECV) and the trips to every park tend to be fairly quick - MK is usually only a 5 minute bus ride!
We prefer VWL because it's so tranquil, and because the people we have met there have always been so very friendly. The lobby of the Lodge is one of my happiest of happy places; I could sit in front of that fireplace and rock away the days with a good book without ever going to a Park once! I don't know why, but even before construction, when WL was at capacity, it just never feels "full". And the buses from the Parks and Disney Springs tend to be easy as well; we have never really seen the crazy lines at the Park bus depots like some resorts have. Finally, VWL has a fairly compact "footprint"; everything is relatively close together and convenient. I never feel like I have to set out on an expedition just to fill my mug at the QS!
CR/BLT feels very "busy" all the time to me, and I come to WDW to relax! GF is so pretty, but I tend to get overwhelmed there. I like the Epcot resorts - and if Epcot/World Showcase is your fave place to be, then I would look there! The only thing I don't like about Boardwalk (for example) is the QS dining situation; but again, that's a personal preference.
I love love love Poly - it is my second favorite after WL, but there are only the 2 elevators to get up to the Monorail level, and last time we were there, one of them was out of service for an entire day, which meant we lined up several times just to use that one elevator! With it being so small, you could only fit one ECV/stroller per trip typically. We had the option to use the bus, or go over to TTC, but I really wish that Poly was just a bit more "wheels friendly". We do tend to limit our time at Poly because we have a family member who gets overwhelmed by the theming, and after several days typically needs to stay someplace a bit more "neutral".
I have yet to stay at SSR - but I do love the boats at Disney Springs! OKW is so pretty and is very relaxing to me too, and we hope to stay there in the next 6 months or so. I *love* Olivia's at OKW; if you haven't eaten there, you should. OKW has the boats to/from Disney Springs (one of my favorite forms of transportation at WDW) but the accessible path down to the docks always feels kind of like an afterthought to me.
In the spirit of honesty, we don't own DVC. I understand the concept and the theoretical benefits; we just prefer to have the freedom to stay where we want, when we want, and not be encumbered by rules, calendars & points. I can, if I choose, rent points, or I can book directly through Disney or my
Travel Agent.
But I still enjoy staying at DVC properties!