For a while, I carried cameras in their "never ready" cases until I realized I was wasting precious time to get them out of it.
But then, the ever doubting process kicked in again. Aren't these things for protection anyway?
So, my compromise is this: I keep them at home under cases, but when they go out, they're naked.
Except the Nikon SLR, though. It's plastic, it's big, it's noticeable, I don't care if people see me using it.