I don't use a strap either but I have worked in electronic repair facilities where they were a requirement. Now this was in Arizona and New Mexico where humidity is normally pretty low - then lower still in air conditioned facilities to the point we even had humidifiers to bump up the humidity. We also had floor and bench matting designed to suppress ESD and our benches were regularly re-certified as grounded to Earth grounds.
When I lived and worked in Mississippi, static build up was rarely a problem, but ESD precautions still were not ignored.
My point is I think it is wrong for those of us who are experienced and disciplined to downplay the importance of ESD suppression - especially in forums like this where we do not know the environmental conditions where the readers are.
I don't use a strap but I always ensure I touch bare metal of the case interior before reaching in. Always! And I make sure I touch bare metal frequently there after to make sure static has not had a chance to build up again while I've been squirming in my clothes and/or shuffling my feet.
Here in Nebraska, less than 1 mile from the Missouri river, it can be in the 90s F and humidity levels outdoors can feel like you are wrapped in a soaking wet wool blanket. No worries of static there. But indoors may be another matter depending on how efficient your air conditioning is at extracting moisture out of the air - which I point out, is what "conditioning" the air is really all about.
So we can be amused based on our own personal experiences where we live and work. But we, as advisors, must not lose site of the fact some folks live and work in totally different environments and static may very well be a real concern there.