One could assume that even if she has adult readers, the majority of her fanbase is children so she has to simplify a little. Still, I agree with you, I think Rowling writes the only way she knows how I doubt the reason is the children. But at least she admits it (or never denied it). Rowling is not so much a great writer as she has a great imagination. That's why the HP have some worth. And she created some rich, well developed characters (like Dumbledore) even if others are a little plain. Which is always good.

I dislike elaborate prose as well (so boring), especially if it's too descriptive. Of course there are very interesting works, but generally I find elaborate prose too pompous and a bit boring. ^__^

I think we're not supposed to get it all. EP is an okay anime but it tries too much at being all intelectual and psychological and I don't think it succeeds all that much. I liked it, but it was a bit confusing and I reckon it was not confusing on purpose. :D