Instant oatmeal is definitely like eating wallpaper paste. I don't recommend it. My favorite are steel cut oats, as MRSSHF has mentioned, but if I'm too lazy to make them, I like "old fashioned" rolled oats which have the most texture out of the rolled oats.
I always cook them with rice milk (in the case of steel cut, I cook them in water for a while until they're soft, then add milk in at the end), and I put in blackstrap molasses, cinnamon, and a little vanilla extract. Then I top with some fruit (berries, diced apple, diced banana) and some toasted chopped nuts (walnuts, pecans, cashews), a drizzle of maple syrup, and it's oatmeal heaven!