Just remember that the power button is still the best way to tell your computer, "I'm done with you for now." It will suspend the computer, which is what most people want it to do.
You should rarely need to manually restart using the Power icon. That's not the greatest excuse, but good UI design dictates that rarely used features should be less discoverable than features you use all the time.
Windows isn't the Windows you used to know. Think about how an iPad "just works", and realize that Microsoft is going towards the "just works" model. It can be better than it is now, but at least that direction has been established.