I've not been to gamescon. Pax West is the biggest conference I've been to.
The overwhelming feeling I get from games conferences is how many games there are. Some are more unique than others. But I am sure that each and every one of them gets some play time from someone.
It's crept up on me how much like music scene (or TV via Youtube) games have become. It's no longer about being famous for 15 minutes; you're famous to 15 people.