For myself I'm not sure in what ways I've really changed.
I still make terrible jokes, I can still get into arguments, I still write large posts and for the most part I still don't get involved with other users outside of the forums.
I think perhaps I'm a little bit more likely to speak up against people now. But that's probably related to me having been here so long I feel confident enough that I won't be entirely brushed off or ridiculed as a new idiot on the forums. (anonymity helps, but I am a member of a community with a name. If I forget up then no one who knows me in person will know I did, but this community will still know that sir dooble forgeted up. And I do care for that, perhaps not quite as much, like I care how my friends and family think of me. sir dooble is one of my names and it is part of who I am).
I have definitely learnt a lot of things being here, and I am honestly grateful for that. Whether I've picked up bits of science from other members, or experienced alternate viewpoints on politics, religion, loveuality or anything else. Just having second hand accounts of life around the globe has been educational and inspiring. I would never have made friends or communicated with Irishmen, Swedes, Frenchmen, Australians, Argentinians, Canadians or Americans if I wasn't involved in this community (This is the only online community I take a decent part in).
It's nice to be educated about those different cultures.
I suppose I can say I have changed on the forums as a result of the forums, but I don't believe that has changed me as a person outside of them, bar educating me.
It's hard to say if the forums are personally responsible for my maturing or personality. I have been on here for 5 years and 11 months.
I was 13 when I joined and now I'm 19, a legal adult. It would be naive to say that growing up and going through puberty, as well as my friends, family and school life haven't been the driving force behind how I've grown and changed as a person.