Agree that BWI can ne a nightmare. Due to some stroke of luck, I haven't been in one of those lines yet, but see them all too often.
I flew out on WN last week with a lot of worry about the lines and leaving on time, esp. since I had to check luggage with the Xmas gifts. There were no lines at the counter or the security check point. Whew. No lines returning at PBI either. However, as I came out of BWI's concourse B, there were about 150 folks in four lines waiting to get through the security checkpoint for that concourse. And that wasn't a security infraction day.