There's on thing I miss from when I used a Windoze machine in my day job in the nineties: Windows Explorer in Win95. It's still there, but I don't know how to make it give the view I found so very useful back then: it had two panes, each one showing a file system tree with flippy triangles, so you could easily oversee the entire file system on the left side, and also on the right side, and so you could move files from one side to the other. I think it's still the best file navigator I've tried, better than Apple's Finder (though the column view improved it).
This is shareware SpeedCommander, which approaches what I mean, even though it insists on separate panels for files, thus ending with four panels instead of two:
One thing though: I think that OS X has much better text rendering and anti-aliasing than Windows 7. Text generally looks better and is more readable.
(Funny enough, years ago tech guru Nicholas Negroponte migrated from Mac to Windows partly because Mac back then didn't have text anti-aliasing!)
On the other hand, I think the Start Button menu in Windows is immensely useful for quickly finding and launching apps and so on. I wonder why Apple never made anything similar, there simple is no simple and easy single entrance point in OS S. It's pretty stupid, to be frank. Well, you can put icons for everything in the Dock, but cripes, does that take up space. And with many, it's equally confusing; there are no sub-menus.