Treadmills are good for catching up on TV! They can also be a good place for books on CD or talk radio.
Here is another way to pass the time on the treadmill. Run intervals! In other words, crank it up to a full sprint and jump on for say 400m (1 lap) then jump off and recover for :60-:90. Repeat for 6 intervals. Or try this, Sprint 800m, rest for :60, sprint for 600m, rest for :60, sprint for 400m, rest for :60, Sprint for 200m, vomit, and go home.
You will be in and out in a shorter period of time and you will spke your HR in a way that allows you to increase your metabolism while maintaining muscle mass.