I figure I should weigh in on the subject, as I wear jeans for the majority of my time that I am wearing pants. As long as they are clean and appropriately presentable I've worn them to interviews, the office, and even got married in jeans.
The key piece in that is appropriately presentable. I wouldn't wear torn blue jeans to work, but I would wear a pair of pressed black jeans. Granted, now I work on a construction site, and wearing Jeans with a tear is OK.
Jeans are becoming more accepted than they used to. Yes, you can even wear them to Church.