My skill level before joining Laracasts was fairly low. I had studied basic computer science on my own for about a year and knew a bit of python, c, php, and html/css. I knew about object oriented programming, but didn't fully understand it and why it was useful. I had made a couple basic static/php sites following tutorials, but had no experience using a framework.
Ive been watching Laracasts videos for about two years now. My skill level has definitely increased and without question Laracasts has been the number one driving force behind that increase. I started feeling pretty confident about a year ago, but looking back, I think that confidence was premature. I feel even more confident now, but I'm guessing that in another year I'll again feel that this is premature. I think thats just how it goes.
I landed my first development job last month so starting May 1st I'll be developing professionally. When I was in the job hunting process, I constantly had people complement my code quality and tell me how rare it is for self taught programmers to write tests. I learned all that right here.
Note that I didnt just simply watch the videos though. I was also coding at least three hours a day every day and reading everything I could get my hands on. Laracasts was my main learning tool, but without practice and a strong desire to learn, you won't get far.