There are so many things you can do with Illustrator and every year with the new releases form Adobe, the number of features grow, and so the number of creative techniques you can use also grows. It can be hard to keep up on using all the features but these tutorials will give you a good head start. And they might even give you an edge over your colleagues and certainly over your competition.
Photoshop is a big, deep program - no doubt about that. There's a lot to learn and there are slow ways and fast ways to do almost everything in Photoshop. In short, there is always room for improving your workflow, speeding your design process.