Strictly speaking, raw foodies do "cook" some food (I mentioned the seared fish that some eat), but won't heat it above 116 degrees based on the theory that doing so would kill essential enzymes. Some refer to this as the "life force" or "prana" of the food and believe that energy is transmitted to us when we eat it.
My thoughts are basically as I mentioned- that of course if your diet consists almost entirely of fruits (fresh and dried) leafy greens, avocados, nuts, seeds, beans, grains, and sprouts you're going to be super healthy, however a lot of foods benefit from being cooked (esp in an iron skillet!) I have no science to back up my perspective, but I just try to eat as many un-processed foods as possible and eat from as many of the food groups as possible. Beyond that, I let it go :)
Eating essentially a raw food diet would be lovely in the summer if I was someone who even enjoyed being in a kitchen and working with fresh produce (or had a personal chef aside from my love, j., i.e. someone I felt like I could hand a menu to), but in the winter I crave warm things.
It also intrigues me how many yogis are raw foodies since yoga is tied in with ayurvedic medicine (Indian traditional medicine, the oldest system of medicine in the world.)
Ayurveda tells me that before bed, to combat insomnia I should enjoy warm milk with nutmeg. Not raw food friendly at all, and very effective :) I generally find Ayurvedic remedies to work, and wish I could see an Ayurvedic practitioner. Alas, they don't tend to (be able to take) insurance, and tend to be as pricey as most doctors would be sans insurance.