Seating
Looks like 150 seats in the "departure" lounge. Could get a bit crowded unless Easyjet are going to buck the loco model and fly evenly spaced departures throughout the day.
On a walk past the other day I also noticed the close proximity of the entry/exit doors to the terminal (located adjacent to each other). This could also be a cause of friction when you have 150 arriving passengers trying to get past the 150 departing passengers on a footpath to the 2 doors that is no wider than 6 feet.
Still - good luck to SEN, the locals deserve a cheap flight to the sun without having to brave the A13/A127/M25/M11 horrors.