My wife and I have a great understanding of each other's needs, which I think is the secret to our success. I'm a geek, and she knows that, so there are no arguments about long hours in front of my computer or 4-hour Morrowind gaming sessions. She also gives me no flak about my time-consuming and expensive home theater hobby. Despite these activities, we spend a lot more time together than you'd think, and that's why we're doing well. In addition to a couple hours each night after work, we usually spend the entire weekend just hanging out together, which is really nice.
Things haven't changed either. All the married guys I know were telling me things would change. I'd tell them we'd already been living together for years, but they'd still try and scare me. Nothing has changed though. We get along great for the most part and each occasionally want to throw the other out the window to his or her death. Normal marriage I think.
We refer to our plan to have children as our 5 Year Plan. It's been the 5 Year Plan for the past three years though.