This thread went it a bunch of different directions.
1) Why are you playing games on a work computer?
Depending on where you work this is playing with fire. If your work policy says "no gaming" you would be violating that by using this site. If a company was really that hard up on enforcing the policy, they could review what websites you are looking at, and you would be reprimanded.
2) When on the job you should be 100% productive at all times, and if not, you should ask your boss for more work to do.
This is silly. This doesn't happen if you are working in a department store, a police officer, or anything else. You would grind yourself into the ground. There may be people that operate at 100% all the time, but it would be an absolute rarity.
3) Is WIS aiding and abetting people by giving a workaround for internet filters?
Yes, so what.
4) If you need to get on WIS, use a smartphone.
Agreed. I was the last person in my workplace to get a smartphone, that was 4 years ago. You're out of luck in the one example of being a secured area, like if you work in a certain part of a military base.