Sometimes it takes them a while to utilize things in their cages, especially if it's new. I've found that the more opportunities you give them to climb, the more likely they are to use them. It's also likely she's using it when you're not around to see her out and about.
Maze really liked the ladder I made her out of bamboo sticks and zipties. She's long since outgrown it, though. My japanese ratsnake has it now --like you said, recycling lmao. But, if you want something a little more visible, maybe consider colubrids?
And, on the Maze front, both she and Lan Fan shed today. I'm hoping to get some nice pics of Maze before the big game tomorrow haha.