I really enjoy the meditative aspects of cycling and just being out on the road and knowing I'm going somewhere under my own power. I like the feeling of speed and power when everything is good and getting out of the saddle to get over a climb. So that's why I hate the idea of loading the bike down with 4x panniers and 100lbs of gear because it changes the bike from a swift thing into a beast of burden almost rooted to the ground. If I lost the excitement of that speed I would loose a lot of the joy I get from touring.
You haven't experienced the excitement of speed until you're flying downhill through switchbacks with "100lbs" of gear on your racks. ;-)