I take it as something like, the hole left by your departure is quickly filled. The bucket hardly notices you are gone. Which is kind of true, watching people

I take it as something like, the hole left by your departure is quickly filled. The bucket hardly notices you are gone. Which is kind of true, watching people get laid off or leaving the company- the machine chugs on. Now, there are serious changes that can happen thanks to the presence or absence of an individual, but that is usually all in politics & decision-making, and rarely in hustle (e.g., late-night grind).