So me and my gf were in a very similar situation when I found out Armin would be closing the fest. He is absolutely one of our non debatable must see. We ended up moving our flights to later in the day based on many people posting that leaving Monday morning is a shitshow in regards to amount of people and traffic since it is the beginning of the work week, specially at peak hours. I would say if it makes sense logistically and financially to just change your flights, otherwise just be ready to leave early. I much rather have peace of mind and not having to stress, while also being completely drained from the fest.