I kept forgetting that Siri now resides inside my Mac as well as my iDevices and AppleTV... To encourage me to use Siri more often, I changed her keyboard shortcut to Command + Space, which was formerly the keyboard shortcut for Spotlight. (I then changed Spotlight's keyboard shortcut to Option-Space.)
Now, whenever my muscle memory presses the shortcut that used to summon Spotlight, Siri appears instead and forces me to—find the file, open the application, perform the Web search, or whatever—using my voice instead of the keyboard.
So far it's working pretty well and I'm using Siri more than before.
Now, if I can just get Siri to order me a pizza, like Amazon's Alexa does in TV commercials...
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