I started, long ago, the Astronomy and astrophysics page later renamed to Astronomy, and I was responsible for its overall structure and most of its content. I have made or added to several related pages, both in physics and astronomy and other areas.
I actually created the page Wikipedia:wikipediholic.
(P.S.: I'm mostly cured now, sadly...)
The pages to which I had contributed have changed so much that there isn't much sense in listing them.