Actions can give you insight into how certain looks are created, yes. However, without knowing exactly why certain steps are taken, I still relegate actions to the scrap pile. BUT, being somewhat of a black sheep of this site, I am a big believer in whatever unlocks your creativity and gives you the tools to create is a good thing, no matter what.
Would I recommend actions to a beginner? No. But if it somehow helps other artists learn, then by all means !
Outside of just exploring PS capabilities, I've never used them.
What resource would you recommend to a beginner in photoshop? I think photoshop has a steep learning curve and I remember being disappointed at first glance because I couldn't see beyond the basics (I.e. crop tool, text, paint bucket, etc). I remember utilizing YouTube for most of my education, but I still had to have an idea of what I was trying to do and then translate it into something searchable. I had purchased 1 book, but the techniques it was demonstrating were extreme cases of photo manipulation, when I was more interested in enhancement (obviously I bought the wrong book).
I found actions gave me an idea of the full capabilities of the software, and though I still can't perform many of those enhancements without my actions, I'm grateful I purchased from someone who has a more thorough understanding of the software. I would love to have the time to learn everything myself, but I really never found a solid resource...or perhaps I just couldn't quite grasp the inter-relationships between techniques, that when blended, offer the look I want. But seriously, if you have a good resource, Would love to check it out.