I gave IDEA 13 a test drive. I noticed that the navigation bar (where is shows in which package/folder the current file is located - blue in the screenshot) and the toolbar (green in the screenshot) is now a single row. I guess this may be good on a laptop with limit screen space - on my desktop monitor in portrait orientation its not necessary and rather bad then helping.
Unfortunately I'm to stupid to find an option where I can split the bars again and make them look like in version previous to IDEA 13.
Can someone give me a hint?