And for being a person who was using InDesign and Illustrator CS6 on a daily basis for work last year, I'm surprised at how much I have learned about both programs in just the Essentials courses alone. I didn't consider myself an expert, but felt comfortable in InDesign especially. And while I was competent in the program, I had (and have) so much more to learn not only about working more efficiently but also the real capabilities of the program itself.
And we haven't even touched on the interactivity in PDFs yet.
Taking the courses on Udemy has been really good for building the portfolio, and it's part of the reason I chose to check out Daniel Scott's courses: he lists that there are many real-world projects for just that purpose.
And that's just what I need.