If it really irritates u then do this:
go to
Control Panel / Power Options / Advanced (Tab) / Power Buttons
"When I Press the Power Button on my Computer:"
Select "Shutdown"
Now you can just press Power button on the front (likely) of your pc(for about 5 secs) and walk away while it shuts down properly.
or
press WinKey+R
type shutdown -s -t 00
press enter.