I don't understand the insistence that the OSX UI needs to be 100% consistent. Perhaps similar elements repeated across different areas of the UI should look and function similarly, but do you really want everything to look the same?
For example, would you like it if every iPhone app UI looked exactly the same (For example if notes, weather, stocks, calculator all looked like the iPod app)? Would you like it if all the iLife apps looked exactly like Finder/iTunes with the blue sidebar and white main window?
Personally, I like windows that are instantly and obviously distinguishable from one another. I think the Finder and iTunes look too similar, and that iTunes needs to look way more distinct and recognizable within a cloud of Finder windows. Each system app should be unique enough to be able to switch to it in Expose without having to read any text or pause for a microsecond to look for it.