Which airports are you flying from and to? Have you got Speedy Boarding? 'Bag Drop' is still just another name for check-in. If you only have carry-on luggage, you go straight to security. If you have hold luggage you go to the check-in desk. If you have SB, there's a dedicated SB desk. You show your online ticket and passport and your bags will be weighed, tagged and sent off to the bag-handling facility. You proceed to security with your liquids in a plastic bag, take all your ironmongery off and out of your pockets (I always remove my shoes without asking) and put it all in the tray together with your coat, cabin bag and laptop. If you're lucky, you'll go straight through and off you go. Good luck and enjoy Spain.