I've been using 2012 for 3 months and honestly I'm starting to like the all caps. As the main menu bar it helps to disassociate it with the rest of the however many toolbars you have open. But really, it's one very small part of a massive IDE.
This is exactly how I run VS 2012. The VSCommands addon[1][2], allows auto-hide of the main menu, fixing case, and some other nifty UI fixes. I expect the author will do quite well just by fixing the stuff people are pissed off about.
I don't believe it has been released for 2012 yet, but I am pretty sure it will be (I can ask Matt tomorrow at work, but I can't see why he wouldn't as I don't believe it would require any changes, just updating the manifest to say it supports 2012).
