I've never used the groups - mainly because I've never seen a sample workflow that I could copy, and my existing workflow is "sufficient" (which means I get a mess of windows plastered all over the screen as I follow sender&implementors, and could probably do better).
btw, I've just spent 60 seconds trying to work out how to add an item to a group and could not.�� I don't even know what it groups - packages, classes, methods???�� So I guess I ignored it, and once ignored, its a bit like that broken step in you building you always walk around without noticing. ��
So discoverability of how to use it could be better, like something in the tooltip that "links" a more extensive tutorial on it, either in or out of image.��