Two things I miss when on Windows:
1) Shift + Backspace to delete a string of text behind me
2) Drag and drop into file requesters! This is a big one, if I find a file using Workbench/Ambient I can then open a file requester in an app and just drag it onto it and it will load it. In Windows I have to navigate to that file a second time, even though I may have the folder already open on my screen, very annoying.
As for no. 2 Albert of Atariage website fame once told me that OSX does this too. As Microcock spend more time copying Apple than fixing their pathetic OS if it isn't in Win7 it will be in Win8 for sure.
I'd check but I am not stupid enough to downgrade from XP Pro SP2 to some god awful mess of a kernal like Win7/Vista/Server2008 etc. DIRT!!!!