Some of what you are experiencing is also probably nostalgia. You remember the excitement and enjoyment you had during that time and the simplicity of not wanting more - just enjoying your experience. I still hold a system dear to me that I had about five years ago and though I've moved well past it, part of me wishes I could rebuild it. Realistically though, I know if I built it I wouldn't have the same fulfillment from it that I had all those years ago.
It's always easy to look back on 'better days' and forget the negatives experienced during that same time - negatives that might have caused you to move the direction you are currently in.

