I'd like to understand how we've changed in our approach and treatment of certain injuries, compared to yesteryear and see how that has had an impact on Emergency Room usage (and the appropriateness of said usage).

I'm not that old (south of 40),  and I recall as a kid, if you bumped your head, it was no big deal. "Walk it off, son. Walk it off" and you'd be right back out there playing 15 minutes later. Would something like this in the present day be treated much differently, with a call for an ambulance and a rush to the hospital with concussion fears? Just an example. Tl;DR: are we treating some injuries much differently, and with much greater urgency than in the past and how is this impacting emergency rooms? Is there a better way?