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I think some people actually do think like this, but I'm with you: I can't imagine how this is more helpful than a linear list.

I don't think we know how we "think" yet :)

It is more helpful in the same way as binary tree search is better than linked list traversal.

Interesting. I use org mode to manage my tasks and a simple C-/ t shows me all my todos, managed hierarchically.

Different tools for different people and if your brain works with mindmaps, that fascinates me because they make my brain stop functioning.