This 100%. Part of my job is writing test cases, which can be extremely repetitive. With multiple cursors, I can frame out a dozen or more cases simultaneously and then go through and fill in the details. It significantly reduces typing time.
Also, if you work with any sort of XML or HTML, learn Emmett abbreviations and learn them properly. It will take you an hour to learn them properly, but they save so much time over typing tedious tags longhand. Being able to type html>(head>meta[charset=utf-8]/+title{My page})+body saves so much time over
<html>
<head>
<meta charset="utf-8"/>
<title>My page</title>
</head>
<body>
</body>
</html>