LoL, yes, they really do. Every rat I've had has loved it. But they should only get it in teeny portions because it's full of fat, and high fat foods can cause tumors. A good every-now-and-then treat, though.
It depends on the rat. I have a super picky rat that will only eat certain things. Generally speaking....I'd say they enjoy it as much as any other treat but I'm willing to bet they'd turn down a piece of cheese for a yogurt drop!
Yes, my girls adore cheese. But I'd heard the lactose intolerant thing, so they only get one sliver (like the kind that comes off of a big cheese or carrot grater) once a week or so. It's a definite favorite, but I've never tried a showdown between cheese and yogies!