If you're still unconvinced and you just want your old shortcuts back, then rest assured: Most of them will still work. However, you'll need to know the full shortcut from memory. There are no on-screen reminders of what keys you need to press.
This means that a new user must look them up somewhere online or grab a book. This is unlikely. Now in defense of 2007 they do have a way to see something like a keyboard shortcut which is using the ALT key. The new shortcuts involve a series of keys rather than a quick combo. To understand more Microsoft has a site devoted to help you learn some of this stuff. A good portion of it is narrated so have speakers on. Give this a try to learn some of the new shortcuts.
As time goes on and my research continues I hope to show some quick fixes for the new system and highlight some of the good points about