We are staying at BLT in March --- this is our first DVC stay. I have a couple of relatives that I would love to see while in Orlando. Could they come visit us at BLT? Not sure how it would work from an access perspective/parking, etc.
As long as your visitors are escorted by someone staying at BLT, they are allowed in. We stayed there last December, and had guests vist us and come up to the Top of the World Lounge, no problem.
We stayed at BLT this past September and had family visit us (they stayed at an offsite hotel). They just drove up to the gate house and told the attendant they were visiting us. He looked us up and then let them through. They even came to the pool with us once. They didn't swim but I don't think it would have been an issue if they had wanted to.