I'd like to explain my point of view. There are two ways to work with such tools.

1. A bottom-up way and
2. a top-down way.

If you go the bottom-up way you have to learn how to use all those widgets - step by step. At the end you know how everything goes and using the GUI builder just accelerates your work. You know what you're doing.

If you prefer the top-down way, you use the GUI builder without a clue about the backgrounds. Of course you're learning a way to handle your tasks, but you miss details. You start fast but you'll never reach "top speed".

It's your decision to choose how to work with those tools.

neniro