dubious design choices like the whole single-button mouse thing
Actually, it's brilliant because it forces developers to make interfaces that can be operated with a single mouse button. The worst thing about some Windows software is that some functions are only available when the user right-clicks in the correct place. Right-click (mouse wheel, and any other additional buttons) should enable shortcuts to frequently performed actions, but should not be required to perform any action.
You might think that sounds stupid, but a lot of (older) people have trouble with this when learning to use a computer.
Strongly encouraging all software to be operable with one mouse button also ensures that software will be compliant with touch-based interfaces which will become increasingly common in the near future.
It's not like anything is lost because you can still plug a two-button mouse into a mac and have it work as expected with contextual menus and all that.
KindGrind wrote:It seems to me some changes were only for the sake of change. Best example of this is the X and - to in OSX to reduce or close windows. Did it really have to be on the left side instead of the right?
The original 1984 Mac OS always had the window close icon on the left, so one could argue that Microsoft actually reversed the positioning when they created Windows.
Regardless, I use Command+W to close my windows.