If you want to get to grips with JavaFX, you should probably install the Eclipse Plugin e (fx)clipse and the JavaFX Scene Builder. Scene Builder is also a WYSIWYG form designer, but this time for ...

Eclipse does not natively support the JavaFX Scene Builder "out of the box" like IntelliJ IDEA does. To get around this, you are going to have to manually install the JavaFX plugin for Eclipse.