Sure, here's a quick, small, real example where I reach for mindmup before anything else:
https://ibb.co/m53P9r7
So I built a prototype CLI in Go that wrapped up a few different technologies and before I wrote any code I popped into MM and "sketched" the command hierarchy and dependencies. It pretty snappy for tossing out linked concepts with the keyboard navigation.
And in a different direction I also use it to organize / reorganize information by visualizing the structure and color coding by particular attributes
https://ibb.co/xHqZdsq
In both cases it is a big help to me to spatially organize my thoughts and look at the relationships either while noodling or while organizing existing information.
Just like this cmap project the management of notes on nodes is still a big clunky / involved (and overall mindmup is not a "slick" product, especially compared to Ink&Switch's Muse).