I can carry it into ANZ with the rest of my gear no problems, but I can't technically use it at ANZ, and if security spot me with it, they might ask to remove the photos, or boot me out. As you know the 70-200 stands out like dogs balls (even moreso with the lens hood on), specially if security are told to look out for large white lenses.
Some of the guards will warn you on entry "is that a telephoto lens, don't use it inside". Others don't even notice it.
I've used it in ANZ, as well as my other lenses, but try not to be seen with the 70-200 just incase security get narky.
I'm an enthusiast/amateur/hobby photographer. I don't shoot professionally, though have the gear too if called upon. As I mainly shoot nature/motorsports/landscape/league all my lenses are gear towards high speed low light. So I've got a 10-20mm f3.5 Sigma, Sigma 24-70 f2.8 DG EX Macro, and Canon 70-200 f2.8 USM. I've also got the old 400D as a backup body, and my latest toy is a Hahnel GigaT Pro Wireless Remote (it's about $100 and bloody brilliant). Allows you to wireless shoot the camera, AND as if that's not cool enough you can program sequences in and have it auto shoot them (e.g change settings on the fly and have it shoot a number of settings at press of button).
I love my toys, and it's one of the good ones
Mainly useful for night time or tripod mounted shots.