I understand what you're feeling. I've had TZ for about 17 years now. I love the game for the theme, graphics, toys, etc. I do enjoy playing it, but it feels like a novelty game. It's not one that I just love to play over and over. Same way with our guests. A game or two of TZ and then they're on to another title...
That being said, I still have it after 17 years, and if I had to thin out the herd, it would probably be in the last few to go because I feel I would miss it greatly.