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When you mouseover search results in Apple Maps for Mac, the pins jump on the map to let you know where that result actually is.
When you change your alarm time in Fantastical for Mac (as well as Fantastical for iPhone), a truly fantastic replacement for Apple’s calendar app, it sweats the details between whether an alarm is ’1 hour’ or ’2 hours’ before an event. You can get Fantastical in the Mac App Store and App Store
When you scroll down a page in Safari using the spacebar, the cursor disappears from sight so you have an unobstructed view of the content. [Editor's Note: This works in Chrome as well (I don't have Firefox) and Reeder, but not other apps such as Mail.] Thanks Ryan Blair!