I really enjoy milk, cheese, yogurt, ice cream, especially the local Oregon brands like Tillamook. But I'm also very honest with myself, dairy is the last thing that you want to be putting into your body.
Think about dairy products from this vantage point - your body creates mucus on contact with dairy in order to defend itself from it. Most people, however, think that the congestion that goes along with dairy is just due to it's physical coagulative properties. Not so, the human body treats dairy as an infection, something to get rid of asap. Sort of like caffeine, your metabolism speeds up on contact with it in order to remove it more quickly from the body.
The standard American diet is a killer. Fruits and vegetables should be the caloric cornerstone for all humans. Most people that try veganism for any length of time immediately start feeling healthier, having much higher energy levels, more mental clarity, etc..