A lot of folks have jobs that involve confidential information. I don't do government clearance type stuff(anymore), but I still have to sign NDAs with some clients because of the nature of their enterprise and I'm often exposed to information their competitors would benefit greatly from if they could get it. Sometimes that confidential information is things we talk about near the computers. Industrial espionage is real, it happens, and the best targets are the people who think it's a myth or paranoia, because they're the ones who won't take the steps to secure from it seriously.
Beyond that, if you're the target of a hack where they got into your computer, maybe you don't have passwords stored in plain text that they can get access to. But being able to study you, listen to what you talk about on the phone or with other people near your computers, can reveal to them what you think is trivial information, because you forgot that you used this or that bit of "trivial" information(like your pet name, spouse's maiden name, best friend's name, favorite team, etc. etc. etc.) as one of your verification questions for your credit card company or credit union/bank. Before you think "well who would just sit their listening", people in poor countries can make a lot of money stealing stuff like that, life changing money for them and at this point, they don't actually have to sit there and monitor you, there's no reason at all they can't just move your audio feed through voice recognition that spits out text files for them to peruse later.
That stuff happens. I want to say it happens "all the time" because it's happening to someone somewhere right now, I guarantee it, but I also don't want people to think I'm saying it's happening everywhere all around them to everyone. Just that it does happen, and what you think is trivial information about yourself, can be the key for a social engineer to steal your identity or get access to your company's trade secrets.