Writing in Word sucks for anyone using imagination towards creative expression. I have no doubt that those who love to write in linear forms, obsess over grammar and follow templates love using Word, but for millions of the rest of us, it doesn’t inspire and Banksy seems to get by without it. I often wonder if people become habitual Word users eventually, more interested in the oxford comma than a new idea.
Ideas were never meant to be put into Word, they are to be drawn, torn up, scribbed on, re-arranged and debated. Word almost certainly means ‘critique’ and ‘literal interpretation’. Hands up who wanted to work in a typing pool when they were young, and who wanted to be in Hanoi Rocks until Razzle died.
Many people, especially creative people are all about being difference engines. The easiest way I know to explain it is to cast your mind back to childhood (tempted to sing “up and around the bend). The kids who loved to ‘read’ comics didn’t finish them in moments, but pondered them for weeks. What was going on between the frames was just as important as visual text. They processed it, imagined what was going on and what wasn’t — and most of them wrote and drew their own comics. Comics were not academic when I was a kid. A sure sign of a vague, wandering mind — the smart kids read books and the diligent kids studied grammar. I liked books and writing too, but liked comic books and was obsessive over the fluidity of handwriting and the formation of letters into words. I grew up to study illustration and typography. I was probably in my mid-20s before I was forced to use Word.
There is an alternative. Scrivener2 is a great non-linear writing tool. I don’t have the inclination to explain it all here — suffice to say, if you like to work in pieces and figure out how the pieces come together, you’ll like it. Then there is the other tool Literature and Latte make – Scapple. It’s a mind map gizmo. It lets you think in organised pictures — move pieces around, and then drag that drawing into Scrivener as the basis of a document. You can also use MindNode too, but I’ve moved to Scapple because I just find it faster to use.
When you’re done — compile your masterpiece for Word, PDF, ePub, Kindle, iBooks and even share it via Amazon.
Playable 
I’ve dabbled in Scrivener but I like your explanation of how it works with Scapple so I might give it a go. I definitely think in different spheres before they end up under one dome of a whole piece of writing too.