I had a similar experience. After I completed my BA in music with classical guitar emphasis, I went back to the beginning under the guidance of an instructor. I feel that walking the path of a beginner as a more experienced player made me a better player and a better teacher of beginners.
I, too, felt like I rushed through the learning process the first time but I was also under the pressure of degree requirements. Regardless of circumstances, I think this experience is common and may have more to do with the learning process than instructors pushing or students rushing. When we are experiencing the guitar for the first time and being introduced to new skills, repertoire, etc we can only embrace it to a certain depth. In going back to those beginning skills we do so with more wisdom and depth of understanding. When I went back to the beginning, my skills were decent. As a result of reworking my technical and musical beginnings, I feel that my playing is much more refined and have a better appreciation of what it takes to really play well.
I'm now playing intermediate level pieces again and still have no desire to push into that advanced repertoire yet. In addition, I'm developing my collaborative playing skills. There is so much wonderful music to play at this level!
So much music, so little time.