Cold turkey and uninstalling works well. In my case, anytime I wanted to game, I'd get a prompt that the 10gb download would take 12 or 24 hours to reinstall. I was looking to game that instant, not tomorrow, so I wouldn't bother downloading. It was a small barrier, but it prevented games from being available at the click of a button.

Let me ask you a couple of questions...

1. Do you want to take a break from work right now and play a few games?

2. Do you want to play games tomorrow?

Uninstalling games, and forcing them to be redownloaded changed the question from number one, to number two. Like most people, I aspire to be a better person tomorrow, so it was easy to say no to question number two, and redownloading.