Nope, haven't used AirPlay in ages. Google Cast is a far better solution---doesn't require tying up another of my devices.
Only when I couldn't find the Apple/Siri remote. No real advantage either as all of the other boxes I've used or use also offer iPhone applications, even for the Android TV box. Guess what isn't available for use on Android phones? An Apple TV native remote app.
Why are you streaming your movie collection via AirPlay instead of just using the Apple TV itself? I could stream my movie collection stored on my NAS either via the Plex App or the Computers app (via home sharing) on the Appke TV. And I can do the same thing on our Fire TVs or the Nvidia Shield TV.
Yup, you can spend $99 for an Apple developer account and sideload Kodi on the Apple TV using Xcode, or put it on an Android TV box by,

, installing it from the Google Play Store. Hmmmm, decisions, decisions.
Snark aside, I'm glad the Apple TV is working out for you. My only point is that, unless you are solely immersed in the Apple ecosystem with tons of iTunes DRM video, the Apple TV offers next to zero advantages over the competition.
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Or I can play it natively on a Shield TV, Fire TV, or Roku, in 4K as well if the content is available at that resolution, without the need for another $650+ device.