Norwescon was the first convention I ever went to, lo these many moons ago. I had been a geek for a very long time, obviously, but there was something very different about being a geek with a small circle of like-minded friends, and learning that there was a whole community of us. It was a little overwhelming, to be honest.
I'll never say that the geek community as a whole is perfect. It's made up of people, after all, and people aren't perfect - something it's always good to keep in mind. Still, there's something freeing about being surrounded by people who understand the excitement you bring when discussing books, movies, games, or other media. It's rare to be able to find someone who understands how exciting it is that a new book by a favorite author is coming out, and is willing to listen to you discourse about the pros and cons of the series.
Additionally, there's the joy of watching people learn about new things. There are frequently things that people will bring up, either during the panels or during random conversations, that I've never heard of, and never knew I needed in my life until that moment. There's something magical about watching someone fall in love with a media property, game, book, or any other thing that falls under the "geek" umbrella (which, frankly, is everything - being a geek is about how you love, not what you love).