We were at BCV 4 weeks ago and we were only asked to show our room key once. We swam and picked up towels the first 4 days not knowing we needed them. I think that is because we swam after going to the parks and they only provide wriste bands them during the day.
We also did Swim the morning of our check out day, and changed clothes right at the pool bathrooms. I threw the wet clothes in a plastic shopping bag and placed them in my backpack. We then headed for Epcot for the day and eventually to our new resort.
It was a fun way to complete our stay at BCVs.