Funny, Mark doesn't even wear a ring anymore. His was a little snug, so he quit wearing it (I didn't let him wear it to work anyway, so he couldn't crush it onto his finger - he did more manual labor back then), then he lost it (I suspect it got vacuumed up). I wear mine mostly at work, but have to pocket it for surgeries and many procedures.
I never wear it riding - too much risk of it coming off, even though I wear gloves. And I do think it would rub blisters. This is my second wedding ring. I wore the old one out (it was a set, so the bands only wore on one side) and I wasn't wearing one for almost 2 years. Finally got around to buying a new band and went with a plain one so it wouldn't wear out on just one side like the old one.
I guess neither Mark or I are so insecure that we think it's that big a deal to wear the ring constantly. Or maybe it's just cuz we've been together so long, we know the other isn't going to step out and be "looking".