Yeah, I suppose technically our vacation starts on the night of the 18th. We leave Seattle at 10:55pm and get into Orlando at 7am on the 19th (Talk about a loooong flight!) Also, how could people turn down a trip to WDW?! They're crazy!
We considered BLT but I heard the rooms were a bit small, and I got worried it'd be too modern and not Disney enough. I am definitely open to trying it out sometime though because the monorail is so nice to have!
Glad to hear you've enjoyed BCV! It'll just be nice to be able to hop from park to park and not have to solely rely on buses. Though you have to rely on buses at OKW, they're actually pretty quick and buses come fairly often. Plus, you only make about 3-4 resort-only stops, and then you're off to the parks (though sometimes you'll have to stop at a waterpark). Not sharing a bus with other resorts can be really nice and I always appreciate being able to have a seat for the ride (I do enough standing on the buses in downtown Seattle that I could use a break on vacation!

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I'd say tip-wise for OKW, if you want a much quieter room, try for something not so close to the Hospitality House. We were way back by Turtle Pond and while at first I was a little bummed we weren't closer to the main area, I realized that it was so nice and quiet that I didn't mind at all. Plus, we could just catch a bus to the HH if we needed to go to the marketplace, wanted to catch the boat to DTD, or wanted to swim in the main pool. Oh and there are resort-only buses that loop through the resort which is nice if you don't want to walk back from the pool/HH.
And yes, take the boat to DTD. It's a beautiful ride and really nice to do on a relaxing evening. I liked OKW because it has a Disney feel with a lot of quietness. Oh and if you're driving, the parking is excellent. Parking spots are right outside of your villa. They have much more of a homey/condo feel than they do a resort feel.