Personally, I'm not a fan of scribes. Our group let us try them out for a few months and decide individually if we wanted on. If you did, you had to contribute some amount to their hourly wage. That was the deal breaker for me. None of them could type fast enough to keep up with me and I typically had to go over various parts of the history or exam.
I looked at the rate limiting step in my flow in the ED. It was not my charting. It was overworked nurses. Nurse A is busy showing her student how to get med from the Pyxis, start an IV, give med X, do an EKG, document a procedure. Nurse B is busy calling report and transporting pt upstairs, so her other patient didn't get labs drawn for 45 minutes. Pt doesn't feel like she can pee and refuses a cath, so no preg test and no rads. Nurse C is at lunch, so others are covering her beds. Nurse D just got a new patient, is checking them in, and can't draw blood just yet. Lab and radiology delays. Pt's family member shows up to take her home and now wants a 15 min Q&A session on every test. The tech has to walk to pharmacy to get certain narcotics b/c the can't be tubed and aren't stocked in the ED. For me, I do pretty well keeping up with my charting. I may occasionally spend the last 20-30 minutes of my shift documenting, but I'm usually waiting on labs/rads or a consultant to call me back.
Now that it's been several months, a few of my colleagues who got scribes have talked with me about it. They don't feel it has made any change in their ability to document or their PPH. They are thinking of getting rid of them.