I was just flipping through my music binder and I went way to the back. I started playing through the songs really slowly like I did when I was first learning and this question popped into my head. It has only been 2 years but I remember when I had trouble transitioning from the single notes to the power chords in the opening of Master of Puppets. I'm sure you still get a cool sensation of satisfaction when you nail something down but it was different when you were first learning. It was more of a feeling of "Yes, holy crap I'm doing it! I'm learning the guitar!"