Tony Buzan, Inventor of the “Mind Map”, Has Died
en.wikipedia.org
en.wikipedia.org
I only find it useful if the edges mean something logical, like cause/effect, or hierarchical like "A is the boss of B". But when it's merely drawing lines that imply some sort of fuzzy "is related" relationship, or "A makes me think of B", it only leads to a bunch of nodes and lines that are a jumble.
I like to categorize things by branch (and use the number, etc. icons to cross-reference sometimes.)
It's not perfect, but it's better than reams of text. I think sometimes the primary value of the mindmap is the study I put in building it.
RIP Tony.
Shameless tribute plug: my mind map project - jumproot.com
And believe me, I use this as a mind map daily.