I'd disagree with that based on the stereotype of windows users not caring about UI or not noticing the lack of things like smooth animations and awkward sizing.

I say that as a windows user and fan (I have a mac, but it's far from my favorite machine).

I also don't feel that mac is any better at managing two windows than Windows.

Microsoft has tried to improve the side-by-side window set-up with their hot spots, but I feel it is a fairly weak implementation, and even though they advertised the feature heavily in Windows 7, I doubt many people use it regularly.