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Copy Link Text
It's very easy to get Copy Link Name and Copy Link Text confused, but they do very different things. Copy Link Text allows me to set up copy format rules, and when I copy a link, it generates different styles of HTML, depending on what I need. This is an enormous time-saver. I used to use CoLT in Firefox to do the same thing.
How often used: Daily, all through the work day.
Live without it factor: I couldn't live without it. This is the single extension that made moving to Chrome practical. Until I found this, I stayed in Firefox. But once I found this extension, I was able to work efficiently in Chrome for all my daily writing. It was, by far, the single most important extension I found, in terms of switching to the new browser.