I agree with you Yoda_san, in my case, I never really liked mashed potatoes so I don't view cauliflower as a replacement.

But I like cauliflower for itself -- and I used to hate it when I was a kid. I like to use it to "thicken" cream soups and by itself with butter and cheese. I've found other recipes to use it in too.

I have also used it to "replace" rice in Oriental dishes -- it works pretty well as a filler in that case, but I've gotten used to eating Oriental dishes without rice so I don't do it often.