My family mashes the potatoes with the water we used to boil them (a little more potato flavor and vitamins and minerals), then adds powdered milk and salt and butter. The powdered milk means you can get a lot more "milk" in the potatoes without turning them into soup. I've had occasional compliments and no complaints from other people eating these mashed potatoes, but that may say more about how polite the people are than it does about the flavor of the potatoesYou can also use sourcream, or even whole fat greek yogurt instead of cream cheese, some people in my family like it better that way.
