I wondered about that too when this thread came up.  The only guys working on aluminum ladders around here are painters.  I've only seen OSHA onsite a couple times in my career, but some of the contractors I work for are very safety conscious and keep a close eye on everything safety related including ladders and ladder safety.

I have a childhood friend that was electrocuted using an aluminum ladder to change a light bulb in his back yard.  Told his wife he was going to change the bulb quickly while she was cooking dinner and never came back.  Had a 1.5 year old daughter at the time so it's not just a myth that bad stuff can happen with aluminum ladders.