Yes, please do. Others have complained as well... though I never seem to have problems.
As for the GUI... it is VERY different, which is good
The removed toolbars and replaced them with Ribbons. The ribbons are dynamic, and only show you options for what you can do at that moment.
For instance.. if you highlight text... you wont see a mail merge function, but rather only see text editing options.
Makes getting through the 1200+ commands muuuuch easier!