This sounds like a cool way to give the snakes enrichment! Even as a single snake owner I occasionally swap certain furniture out of my BP's enclosure the same way some dog and cat owners swap the sets of toys they have out at any given time to keep things fresh and exciting. I've found that after a while my BP becomes less interested a certain piece of cage furniture but he will thoroughly investigate and climb all over anything that is newly added, even if he has had the same item in his enclosure before.
There are definitely different personalities out there so I'm sure some do prefer a more sedentary lifestyle like yours! I found with my BP that age and his level of comfort in his environment also affected his nightly activity levels. Until he was around 1.5 years old (I realized I accidentally typed the wrong age in my first post, he is currently 2.5 years old) and had been with me for around 8 months, he also didn't come out of his hide much or climb at night. I guess maybe hormones or his sense of security in being bigger made him more active.
There's also the possibility that your snake is a ninja and quietly enjoying his cage furnishings when you're asleep![]()