I think that cream cheese is o'kay in moderation but not on a regular basis and in large quantities. In my opinion it is too fatty for kittie's liver and they use salt and maybe sugar (I don't remember, sorry) which is not very good for a kitty if they get a lot of it.
Well my cats & kittens do not get straight cream cheese. It's only one ingredient in the recipe I have for kitty pudding. It also has goat's milk, water, egg yolks, yogurt, etc. So I highly doubt the amount of cream cheese contained in the amount my kittens eat during the weaning process can do any harm. I've been using this recipe for years without any problems.