When I think out a problem I tend to do so in words rather than diagrams, on paper, or in Obsidian (or the FreeMind mind-mapper, which is really just a graphical outliner) until I have the whole thing in my head and all the relations are clear in my head. I don’t mean that I picture them, but everything fits together and I know it. By then I can write down and implement the solution.
It’s a very non-visual process, and I can’t really explain just what’s going on in my head. I think of it as loading the problem into my back-brain, which then condescends to let me know certain things about it. The actual structures, if you can call them that, are mostly hidden from my conscious mind.
But it works. I’ve been at this for four decades, and I’ve a reputation for writing reliable code. But it’s deeply weird, even to me.