"Actually Halloween is really catching on in France. (:"
I came thru 2E yesterday and was shocked to see CHRISTMAS decorations up in the Duty-Free area!  Yikes.
IF you can't figure out where to go, ask one of the very nice folks wearing Air France uniforms.  They will direct you to the Delta Check in area.  I did not check a bag yesterday so did not have to do that.  
Do you by any chance have Sky Priority status with Delta?  IF so, there is a different line for you for passport control and security that does not have as many people in it.
Go ahead and download your boarding pass today.  Mine told me what gate the Seattle flight left from although it changed twice that morning.  The gate #'s were all "K" gates and were the ones in the 50 range which are downstairs.  That means you will load onto a shuttle bus for transport out to the plane and will walk up the exterior steps to enter the plane.  I eventually left from K53.  I think last Fall I left from K52.  When you check your bag the agent will tell you which gate.
If you want to get away from things, on the main floor where you enter from Security and passport control, walk all the way down to either end, preferably closest to where your flight gate is. There is seating there that is quiet and faces out onto the tarmac.  Give yourself a little time to get downstairs if you need to leave from one of those K 50-something gates.  Also, scope out how they have the boarding lines set up for the different Delta Zones and know which boarding zone you are in.