Potatoes don't go away, I have lost the craving for bread but a potoato with sour cream (shivers)
How I handle the potato--at home, I make potato soup with lots of cream and whatever green veggies I have, and just one potato. That way, you get your mealy-potato fix with a very small portion. (Other people in my family eat this soup, too, and just get a quarter of a tater).
In the restaurant, I pile butter and sour cream on top of the potato. Generally, by the time I work my way to the actual potato, I don't want but a few bites.
I also need for other people to order dessert so I can have a bite or two.
But this sort of thing is the only time I have to control portions--I can have as big a steak as I want.