Ooh... just discovered that Darktable *does* allow rearranging all the filter/module/iop panels into different categories / tabs!
I think this shall fix a whole whole host of workflow problems I have with it currently (since there are a bunch of modules I use almost all the time, one after the other, and a whole bunch of others that I've discovered are rather lame / useless for my purposes). Hopefully!
The following screenshot shows the window that I'm assuming lets you shove these into the categories that you really want to be using...
It can be accessed by clicking the "Hamburger Menu" (last item to the right) on the row of tabs just below the Histogram