Me. Always. On my work PC, home laptop, cell phone, iPad, and anything else that passes through my hands. If I want to watch a video, I'll turn the volume up and/or put on headphones.
I found Siri to be very irritating on the iPad. I accidentally pressed the button wrong, Siri would beep and ask what I want, even though I have all sound turned off (and while I'm in important meetings). So, I made a dummy jack that I keep plugged into my iPad. It always thinks there are headphones plugged in and never activates the speaker. I later figured out how to completely disable Siri, but I always keep the dummy jack plugged in anyway.
I also unplug our toaster the second it finishes and starts beeping to tell me it's done. And I stop the microwave when it has one second left. I guess I really don't like things that beep. To me, they're bleeping annoying.