Congragulations,
All joking aside, getting married was probably the best thing I've ever done. Then again, it's only going on 2 years, so it could go downhill (though, we've lived together for over 5 years, so we're pretty settled in).
Though, one note, things do change after marriage. You will give in to certain stuff a lot more often. One thing I would do, once your actually married (not an issue in the engagement period) is to set some time for you very early on. If you like gaming, make sure you have a certain block of time each week that is for gaming (or anything else you love). It doesn't have to be a ton, but 6 months in, you'll see your wife intruding on that time (oh, watch this sappy movie with me, oh run to the store). They seem small, but it builds up. If you don't take any stand, you'll lose all control and time.
Not saying cause a fight over it (fighting isn't good, though sometimes neccessary), and you definitely need to give in to make a marriage work (we all do), just make sure there is a bit of you time still in there (especially if you work more, since she'll have her time then).
Congragulations, and you might have just made the best decision of your life (assuming you found Miss right).