Swing GridBag + Netbeans 4 = Love
But ever since Netbeans 4 was released, I have been liberated of this curse of the GridBag. NetBeans makes Swing development fast and easy and no more messing around with gridbag constraints, layout issues, etc. (unless you like to). As part of my customer facing job, I have used all the Java IDEs out there. But for me, when it comes to Swing in specific, and Java in general, nothing beats the new Netbeans!
I Love NetBeans! Thanks, Netbeans team!