Everyone has updated to Mac OS Mavericks 10.9.2 for security purposes, right?
My absolute favorite change not mentioned in the release notes: The dock doesn’t get stuck on multiple monitors, where you have to keep dragging your mouse down to get it to switch back and forth; it just pops up instantly on both.
It probably doesn’t seem like it’d be much of an issue, but I felt like I was wasting mental cycles trying to avoid the bottom of my second screen. Like in Windows, where each application has its own menu bar, and you can’t just reliably throw your mouse to the top-left and know you’re gonna hit it.
Now having the dock on both screens will be a useful feature, instead of something best avoided.