This is one for American management, the biggest losers of all time, the unwanted babies of modernity (and postmodernity), the essence of redundancy made flesh that's going to look like the joke that it is down the road, in the annals of our national history, and of the species.
I'm not even going to go into examples and contexts here, but we all know some douchnozzle who's spouted this line either as a preface to something more inane and meaningless, or an equally meaningless addendum, maybe a lame parting shot because they lack any wit. OK, that's untrue, because you only need to add a "t" to create the word that describes them best.
This is related to the more recent "mansplaining," by the way, since it emanates from the same crowd of stupid males who are constantly out of their depth, who lack any real intellect, but sure know how to spew crap from the wrong orifice. No, this isn't merely about your asshole boss at the office, or politicians, but it does start with domestic tyrants, people whose families would be doing the world a favor by beating them down every morning into their bowl of gruel, and with luck, drowning them in it, but really, doing anything to make them shut the fuck up for once in their unimaginably pointless lives. These are the assholes who killed God. He died of disgust, committed suicide: "I created that? Well fuck me..."
Diagram a sentence--if you dare--and you'll find that "At the end of the day" and "The bottom line is" add nothing to the meaning, try it some time, you'll see. That's never going to stop assholes whose souls died shortly after birth from spewing it. How else are they going to be the assholes they are? All it does is underscore their own lack of meaning and purpose in a universe that doesn't care because it can't. At least they're dead forever too. If they found a way around it, I'd be leading the mob of torch bearing villagers to drive a stake through their blackened hearts.