I use it a lot in my assessment and plan. Not just for helping with diff but in explaining my thinking and copying and pasting. Like I was waiting a week to watch lymphadenopathy before screening labs, and it gave an algorithm and I built off of that. It's kinda like how the ED sees 8 patients and has time to explain in five paragraphs their thinking for OM vs encephalitis.
Sorry to any ED doctors out there. I doubt an ED is using AC.