Congratulations on 10 years! I bought my first ereader back in March and somehow stumbled over MR in May while searching for some sort of library management software. I stayed in the Calibre forums at first. When I lost my fear of someday losing my drm-laden books, I hung out in the Reading Recommendations forums. I enjoy the Book Club and have read all winning books and some runners-up. The natural progression led me to the Book Buying Addicts Thread.
I probably spend most time now in the Deals and Freebies forum. Like others, I go to MR every morning right after pouring the heart-pumping cuppa joe. There is still too much to discover to suggest any changes or improvements.