I find that the games i play tend to take up alot of upload bandwidth. Especially when my brother is on Vent & playing his games as well. Its just nice to have that low latency and speeds there.
Btw once Verizon's Fios is in my area, which is 15 mbit down / 5mbit up for the same price as comcast, i'm definately switching over unless comcast can compete.