Flew out on the last flight from JAX->BWI yesterday(they closed the airport around 1PM in advance of Tropical Storm Gabrielle). I made it twice through check in lines (US Air) and security screening in 30 minutes.
Btw the security screening (after you made it through the cursory ticket check) was no different than pre Tuesday. Put the laptop on the belt and whoosh through I went. Two police were present at the end of the security built but that was it.