This is a small detail, but it really bothers me that the collapse/expand arrow is so close to the 'discard all your work in this section" X mark. It is particularly terrible that if you mouse over them just so, they will move about, even appearing to switch places.
Why not move the C/E arrow to the left of the section words, and move the X to the far right, standing alone, where it is easy to avoid. Example:
> Section Header X