We just stayed at BLT over Christmas and they let us go up there. I wasn't sure, since I had heard varied experiences on the boards. I explicitly told them we had rented points at check-in and the guy who checked us in checked with someone else and they said we could use it. We went up a couple days later (different people at the desk) and all we had to do was enter the pin I made that corresponds with your MagicBands (I did this during online-checkin). That brings up your reservation and they can see that you are staying on points. Anyway, it's at least worth asking! Although we ended up preferring the sky bridge as a place to watch the fireworks. They also pipe the music in, and it is not that crowded because you have to be staying at BLT, not Contemp.