JDT has separate wizards for creating classes, interfaces, etc. If GDT follows this pattern, there will be a lot of items in the New context menu. Instead, the "New Groovy Class" wizard could be enhanced to support selection of other Groovy archetypes.

It may also be nicer to have lesser-used options on the second page of the wizard. This could reduce clutter and make room for additional Groovy-specific controls.