I’ve been lucky, I suppose – I’ve practically never been asked prying questions. I frequently use infusion sites in plain view, but no one has been rude or invasive about it. In the 4+ years that I’ve used the CGM, I think I’ve been asked about it three times - once a simple inquiry in the locker room of a gym by a very old, close friend. The other two times were PWD who saw the CGM and inquired because they’d been considering getting one themselves!
Yes - driving and, for me, also when I exercise or ride a bike. Makes a quick check simple and unobtrusive! Also useful for work situations like meetings, but then it’s a bit of a double-edged sword, since alarms are just annoying at times like that! (Watch helps, though!! )