Hey Jensenesen,
great!
Simply imagine the following scenario:
CB with three columns prepared within template
Each column holds a CB
the center column will be needed to split up into two new columns - throw in a template with two columns (again each column has a CB)
Now target ... and to find that stuf while editing: we have these nice little editor pencils

....
See the picture?
If I prepare a bunch of templates and CBs, it's rather a question of keeping the overview (I say: cheatsheet

)
But this can be enhanced even more - and would be even cooler to handle if CP html would have a templating possibility ( but seems to work with wysiwyg too

)
....but perhaps this is only one way and there are many others?
btw: this urgently came up again while reading this insane discussion about y aml license practice - very unsatisfying stuff...