We voted in Campana, organization was Argentina-style: mesas were indicated in chalk on the ground in front of each queue (and so invisible for new arrivals...), voters were called 5 or 10 at a time into the school to queue a second time, here we showed our DNIs, said which "orden" we belonged to (mesa and orden are indicated on the voter roll which we had checked on the internet). The people manning the mesa had rolls with our DNI photos on them. Then everyone got to walk individually into a room where all the party lists were, spread out on tables, you took your list, folded it, put it in the envelope and left the room. Possibly you could split your vote among lists by tearing off individual candidate sections. Back at the mesa we signed the roll, got a receipt, and left.
It was quite slow, the queues outside were 20-30 people for each mesa with 6 mesas in operation, delays inside were because of people taking too much time in the voting room (5-10mins for some, quite annoying).I think it all took about 45 mins in total. At least it was all very calm, no shouting, queue-jumping, or anything like that, the police (2) were very relaxed. There was also a soldier who looked utterly bored.