My answer would be a definite maybe!
We do splits all the time. However most trips are longer and we will do a couple 2-3 days at one resort and 4-5 at another.
The nice thing with the split will be that you will get to try out BWV and see if you like it for future trips.
Being your anniversary if its just two of you being able to walk to EPCOT for dinner and walk the boardwalk will be nice.
We had a last minute trip where we actually did a 3 way split to experience resorts that we had not stayed in. We understood what we were doing and even had Bell Services move our luggage, knowing that we would not see it for most of the day. We planned our days appropriately (had backpack with bathing suits etc), did not rush to get in the room or luggage and had a great time.
All depends on what you like to do. We have friends who need to unpack every item when they travel and are obsessed with worrying about all the details.
One thing that we did was on the day we were checking in at BWV after staying elsewhere we visited a park near there. We took a break from the park, checked in got our keys so when room was ready we could go to it if we wanted to. After getting keys it was to the pool or back to the park.