Tim pointed me at the video of the test run for evacuating the A‑380 — it’s worth a look. I noticed, however, that it wasn’t exactly a very realistic test. If you read the page rather than just leaping to the video, you’ll see the discussion of an earlier MD-11 test where a woman over the age of 45 tripped and fell; bear that in mind when you watch the A‑380 evacuation video.
What struck me about the video was that the evacuation was not only carried out in ideal conditions, but the participants were also all ideal. All between the ages of roughly 20 and 45, all wearing comfortable trousers, none of them overweight, none of them carrying or cajoling children or babies, none of them in wheelchairs or connected to oxygen supplies, none of them in high heels or flimsy dresses (or good suits, come to that). All were fit and able to jump on the slide without hesitation. In a plane carrying over 850 people, what proportion will be in some way encumbered, and how big a difference does that make to the evacuation?
In a lot of ways the video reminded me of the films that are always being shot around Vancouver. One I saw being shot at Vancouver airport had lots of extras towing bags around pretending to go somewhere and looked unrealistic for the same reasons — no-one was overweight, or elderly, or had babies or children, unlike every airport I’ve been to recently.