You probably would enjoy Goodreads. Like you I don't set goals, but I do really enjoy keeping track of things.

My goal is to enjoy what I am reading. I don't really care about hitting a certain book/page count.

I spend most of my work day coding and reading scientific publications, so if I don't feel like reading when I get home, the last thing that I want to think about is having a reading goal to hit.

EDIT: however, I DO have a single goal. I want to read every book from Stephen King. I would say that right now I have read about half of them.