There really wasn't anything specific. I just miss the mysticism of playing blockland as a child. Everything was new and exciting.
I do feel that I missed out on a lot because I was so immature, and afraid to communicate with people on the Internet. But to join adventure servers and stuff and not ever really know what was going to happen in it was one of the best things. But I don't think I could appreciate it anymore. What I miss most about classic blockland is my childhood.