My cats know what "all done" means, too. If I'm running the vacuum they hide. If I turn it off they still stay hidden. Once I say "I'm all done" they reappear!

My orange male kitty, Tigger, is smart and he hears the same phrases over and over again from me. I talk to them all day and usually say "Momma loves you" quite often throughout the day.
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Yes, I do talk to them like they're people. I noticed last year that Tigger will make the "Momma" sound when he meows. Two short little meows close together. I believe he's copying what he hears from me. Might not be.....but it's fun to think he's trying to talk!
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