<p>Many types of engineers COULD use CAD, though most don't use it very much. ChemEs and BMEs could use CAD but I'd say it is less likely than MEs and Civils.</p>
<p>CAD is like programming languages, though. Once you've mastered one, it's only a slight pain in the rear to pick up another one, and you can do it pretty quickly. Lots of CAD suites out there, and preferences vary from field to field and from company to company.</p>
<p>Wiss Janney uses AutoDesk. Walter P Moore uses Microstation. Lockheed Martin uses something from IBM. Chances are reasonably good that you're going to have to pick up another program when you get into industry, so for now, just learn whatever's convenient.</p>