Over the years, online, we've laid down a huge amount of information and data, and we irrigate it with networks and connectivity, and it's been worked and tilled by unpaid workers and governments.
By visualizing information, we turn it into a landscape that you can explore with your eyes: a sort of information map. And when you're lost in information, an information map is kind of useful.
Personally, I find visualisations great for helping me understand the world and for sifting the huge amounts of information that deluge me every day.
I love information. I want to stay current. I don't want to be under-informed. But I'm busy. Sometimes, I need an instant overview of a situation that I can grasp in a second.