...that lets me add boxes with lots of text & links into the tree/structure, ones that I can see without clicking on "notes" like in XMind and other programs... Something kinda like in this draft I made in photoshop.
Most of the programs I checked don't let you put comments or notes directly visible on the map.
https://en.wikipedia.org/wiki/List_of_concept-_and_mind-mapping_software
It's called Green is my pepper or GIMP
>>59036051
Have you had a look at pencil. It's open source and I'm pretty sure you can write comments wherever you like. Just Google pencil application and you should find it.
>>59036156
Zim
try dia or libre office draw
>>59036631
>libre office draw
Thank you those two look interesting. If everything else fails, I can stick with CorelDraw....