I think the "literally" thing was overblown by everyone wanting to sound smart on the internet. It's not that big of a deal.
You can say, "Aw, man. I'm so hungry I could eat a horse." And that's cool. But if you say, "Aw, man. I'm so hungry I could literally eat a horse", somehow you've crossed the line of acceptable? It's just people adding more umph to their exaggerations. I don't understand why everyone wants to take it so literal. "I can look past the part where you said you could eat a horse. That makes sense. But when you said 'literally', that was a bridge too far, my friend. Literally, a bridge too far.
"
It literally makes me mad enough to kill someone.