Just used MySQL Workbench Beta 5.2 for the first-time. Why? Extra backups for the server upgrade, better safe than sorry.
MySQL Workbench is now much more than just data modeling – modeling, Querying and server admin are now done in one place. MySQL Workbench replaces MySQL Administrator and MySQL Query Browser.
Other improvements I liked: easy to use with a better UI, you can use SSH and your passwords are now stored in a secured vault.