We do, but mainly for seminars ajdn thejn register. depending on see leader will count and check (someone been called out because signatures =/= people there, and was accounting sem, and leader said it was fraud all this..., hilarious!), but for most lectures not...
Best bit in a lecture though was one lecturer saying "we need to do this as we have a lot of Asians here and have to check their visas" - priceless! But true!