Lush, I find the same is true for me. My hair is thin and fine, but it drinks up the thicker conditioners and doesn't weigh it down. I know a few years ago a stylist told me that my hair needs lots of moisture and that was the first time I'd ever been told that.

I do have to be careful with some of the cream stylers I use, especially the Curls stuff because those can be a bit much for my hair. But for conditioners, the thicker/richer, the better for me.
CG-modified since 4/05
2b/3a and 3b on occasion!
Products: The hair aisle in my own cabinets.
Best definition winner: KCCC
Best volume winner: LOOB