The most braindead "security" measure is the prohibition of liquids. Many airports don't even have any drinking water fountains at the gates! If you are thirsty you need to buy bottled water for 6€ - 10€ per liter. (Sometimes I take water from the toilet, but it's not safe to do on every airport.) It also causes lots of unnecessary plastic waste, both at the gates and on board. Personally, I would just like to bring a large bottle of water instead of drinking from these tiny plastic water cups.

I try to take the train whenever I can afford it (money and time-wise)