After having used the new WordPress 2.7 (which is not even beta yet) for some time, it is clear that the vertical dashboard navigation has been a bad design choice.
The aim of this revised design was to minimize vertical scrolling and make everything easier for both new and experienced users. The fact is that for me it has made the navigation more complex and has moved every action several clicks and scrolls away.
Why? Because information of equal importance cannot be aligned vertically. Items at the top will always have more importance than the ones at the bottom.
Another reason is the expanding and collapsing nature of this menu — every time the link you are looking for is in absolutely different position (in relation to browser chrome) depending on the menus that are opened.
Here are some screenshots of a real Dashboard from a real WordPress user:
What do you think?
What has been your experience with WordPress 2.7 so far?