I'm just a student, as well as a former E2 noder. I signed up on September 9, 2003 and now find I prefer Wikipedia to E2. Sadly I've seen E2 break down into a social room, the nodes filled with banter but accurate fact is getting hard to find there. I'm very impressed with Wikipedia so far.
I write the occasional article like this one but mainly see my role at Wikipedia as that of a copyeditor/general maintenance person, having a bunch of articles is nice, but a bunch of well written and correct articles is better. Doing maintenance tasks and fixing typos/phrasing mistakes wherever I find them.