I've seen some pretty decent crowds in london, though with those crowds everyone is moving in like a sea of people, everyone going in the same direction. In Milan, there were less people, though they were going in all different directions. Finding which track we were supposed to get onto was also a bit of fun. Luckily the guy that sold us the ticket understood English. The ticket machine didn't want to take our tickets, so we just walked through an open gate. Once on the metro it is a very fast wat to get around and we used it a lot.