We noticed the increased security this year, too -- although much of it was really just theater.
Example: We carried in an oxygen bottle onto the grounds from the N40 in a backpack (the Aerox guys filled it for free). It could easily have been a bomb, for all the cute little gal at the entry gate knew. But she just smiled and waved us through.
I did get a bit freaked out when we visited the museum, though. I wandered off by myself for a bit, and stumbled across a group of Muslim men on their knees, saying prayers.
I must confess to making a beeline out of the area. The museum was packed, and would have been a juicy target for any terrorist.