I like it in curries a lot. (curried lentils, curried potatos, curried chicken, and more).
I love making a dandy blend coconut latte. (you mix dandy blend in half hot water half hot coconut milk to taste, and sweeten with some maple syrup if you want.) It's so good. (dandy blend is a powdered dandelion root/chicory nutritious caffeine free coffee substitute. it's expensive though. really good in a latte like this.
coconut milk in sweet potato mashed potatos is so yummy.
mostly curries though.
for smoothies, I think I would just use coconut milk instead of any other liquid. you could use a little, or a lot. (a lot of people also put some coconut OIL in their smoothies.) I'd personally make a milkshake-y thing I think with lots of coconut milk, some frozen fruit, an egg yolk, and maybe some yogurt.