I also work with avid. We learned it in school and it's still very common in the industry. Like 'skamoe said: it's very different then premiere/fcp or any other editing software. You do most of the editing with your keyboard. Nearly no drag and drop like in the other programs. That makes more difficult to learn but at the same time very fast when you're used to it.
One other big difference is that avid works with a different media management. You basically have to convert all your files before you can start your project.
Normally it makes sense to use avid when you work on a bigger project with lots of media and stuff. For short clips (with a lot of effects) it's easier to work with premiere/fcp or something like that.
Hope that helps.