OK - I'm going to agree....KEEP the split stay. In September, we're doing a night at the AKL (because we all love it so much) but then the rest of the trip at BLT/Contemporary. I can't argue with the convenience and coolness factor for the kids of the monorail. My daughter counts that as a "ride" she loves it so much. So we do the BLT stay for the longer part and for our Magic Kingdom days and then AKL for our AK/Epcot days.... so it will definitely work and you will have a great time. I think you will really enjoy both and they are so different...but AMAZING...in their own ways. And if you won't be back for a few years, get the best of both worlds!
We usually drive so we always have a car. But we typically park it and use it maybe once or twice the whole trip. Not worth is to us but everyone is different...
Have a BLAST!!! And resist the urge to rethink your resort decision. Consider it done and now you are on to ADRs (which it sounds like you are in good shape) or speculation on when the new Mine Train will open....much healthier!