I LOVE Indy Fast Park.  I personally use this lot and my membership to park before I fly.  From the time I enter Indy Fast Park gates to the time I am at the airport drop off door it is only 12 minutes!  And; when I return, I walk over to the same door and I never wait longer than 2 minutes for the shuttle bus to come to get me.  Try it!  You will love their service!