To make a rash generalization, there are definitely three groups of people when it comes to Office 2007. You could almost consider these the "#1 - Hate", "#2 - Accepts", and "#3 - Loves" Office 2007 ribbon acceptance spectrum.
#1. Longtime, hardcare Office users that have tricked out their setup so they can do practically everything with use of their keyboard and macros, right
Charlie?

For these users, most if not all of their macros break and they have to relearn/redo their way of life. I know Office 2007 lost some of these users to OpenOffice and other platforms due to the lack of a 'classic' or 'legacy' mode. These are the kind of users you don't want to lose, however, because they can be very vocal and very loyal if you treat them right.
#2. Middle of the road users that have used Office versions in the past but aren't opposed to change and don't have any specific needs that are broken by the move to Office 2007. There are a lot of people in this category. They may grumble or be annoyed with the changes at first but eventually figure things out and tend not to go back to the older Office suites. I find myself as a member of this group.
#3. Users that have never used earlier Office versions. They tend to pick up on the ribbon and the user interface right away. The uptake or initial learning curve seems to be less than the earlier suites.
Why am I going on and on about this? Well, there is a cool product out there by a fellow MVP that adds the ability, as close as possible, to get a 'legacy' mode in Office 2007. It is a program called
Ribbon Customizer. The free version is all you need to do this. If you want to go crazy with ribbon modifications, grab the professional version.
It might not win back all the people in group #1, because it can't fix broken macros, but people who want the look and feel of Office 2003 as much as possible will love this program.
Note: I don't own or use this program but I have installed it a few times for friends and others that wanted the "Office 2003 feel", so this is definitely not a sponsored post or anything like that. I just post about stuff I think is cool or useful. Nothing more, nothing less.