Tech Help: Missing Airplay Icon

After milking the last drop of usefulness from my old MacBook Pro, I finally bit the bullet and upgraded to a new (Retina) model. One of the things I was most looking forward to was the ability to restore balance to Emir's AppleTV access from his MacBook Air (my old MacBook was too old to support AirPlay). After migration was complete, I was super bummed to discover a missing AirPlay icon. Was Mavericks buggy? Was I an idiot? Countless web searches revealed similar problems but surprisingly, somehow, I couldn't find the solution. (I could still stream via AirPlay, but only  by manually manipulating my Display Preferences, not via the shortcut icon.)

"Call Apple Support" was on my to-do list for weeks. I finally bumped it to the top of the list. Turns out, the solution was embarassingly simple, and I had been painfully close to discovering it on my own, but had always had both settings set to the affirmative, and that was the problem.

Counterintuitively, the trick is to leave "AirPlay Display" set to off, while turning "Show Mirroring Options" on. Am I the only one who missed this? Why wasn't it set on by default? (Maybe due to migrating from a non-AirPlay enabled MacBook?)

Either way, if you find this helpful—you're welcome. :)