I notice that when I package stuff I’ve done in computer school studio sessions and store it on my external hard drive to take home and do further work on it that I frequently get messages that my Adobe CS6 InDesign, for example, cannot open the file because it was done in a more current version of ID. I can really only open files I’ve saved as PDFs. So it might be worth it just to be on an even basis with the CC version I’m using in computer graphics classes.
As I said upstream, 3rd party plugins are becoming more attractive to those who refuse CC. I am more familiar without Photoshop and Lightroom 3rd party alternative plugins though.