Well, you do get used to it. After a couple weeks you will look back at Outlook 2010 and think it looks rather old-fashioned. Really! But if you truly want to tone it down a bit, there are some tweaks you can do.
The number one thing is to change the theme to a light gray or a dark gray. Click on the FILE menu, and choose "Office Account". You will have the option to change the THEME to light gray or dark gray.
Other display tweaks can be found at: