I've got 2 of those kitty tunnels. They play with it occasionally. But for the most part they don't bother. I'm sure if I put them away and then brought them out again later, spraying catnip on them, they'd go wild.

I had 2 cat trees in my room. When I moved one of them in front of the picture window of my kitchen, they have been hanging around it since.

I've been told that if you take away kitty toys and then bring them out again, the cats don't know the difference.