We flew out of Indy last March, flying nonstop Airtran. Our flight left around 7am. We checked in online the night before, had a family member drop us off outside the terminal, checked our luggage in the booth there outside the terminal, and were through security in a few minutes. It was a long line but moved fast.
The check in line was LONG LONG LONG - I am so glad I checked in online the night before!
I think we made it about 90 minutes before our flight, and spent most of that wandering around waiting to board.
Indy has a great airport, security was friendly, everything was neat and clean and well-laid out. We were shocked out how unfriendly MCO was after Indy (my first commercial flight, so I'd had no idea what to expect).