You could be on to something, although I do believe that they are individuals with their own personalities. I have one crestie in particular that I got from SandFire as a baby, which I have made a pet out of, and although her cage, like all of the others, is full of branches, fake vines and cork logs etc., she comes to the top of her cage when I talk to her because (I assume) she knows that I'm going to take her out and carry her around the house, and let her leap onto my down comforter (or my hubby's expansive belly!) a couple of times. The others which I handle less frequently seem to prefer to stay in their cages, but then they are beautifully "decorated" if I do say so myself. I have do have some limited experience with sparser cages: my hatchlings are in critter keepers on paper towel with tree branches (sticks)(no real good hiding places), and they DO try to escape when I open the cage to add crix or clean it, which would lend credence to your hypothesis.
-----
Terri
4:8:5 crested geckos: Popcorn, Goldfish, Harley, Bear, Big Red, Olive, Smudge, Blackie, Belle, Brilliant, Tina, Brick, Avis & Subtle, Toni(y), Kermit & Zipper