MySQL Workbench

 The MySQL Installer 5.5 package includes MySQL Server 5.5 GA, MySQL Workbench 5.2 G and MySQL Connectors (.Net / ODBC / Java / C / C++) GA.  The package can be downloaded for windows in:
http://dev.mysql.com/tech-resources/articles/mysql-installer-for-windows.html

With MySQL Workbench, you  do not need to install   mysql-gui-tools separately. 
When you open MySQL WorkBench, you can clearly see three parts: SQL development, Data Modeling, Server Administration.  SQL Development replaces previous MySQL Query Browser.  The third part Server Administration in MySQLWorkBench replaces previous MySQL Administrator from MYSQL GUI tools.

To add a new  user in database in MySQL WorkBench:
1) Start MySQL Workbench 5.2 CE application, and click server Administration near yellow icon
2) Click "Users and privileges" under Security in left panel, and click add account.
3) Click Schema Privileges at the top menu, click "Add Entry" to select object rights.


In this way, you do not need to run the script to "Add new user".

You also can select "Data Export" and "Data Import/Restore"  in Server administration.