I should clarify that what I described in my post took place during adolescence (age 10+), not childhood. The case for restricting screen use during childhood is more clear.
>It made you get creative, and it forced you to concentrate and maximize your leisure time.
Creative in coming up with ways to evade authority, perhaps. I was intensely paranoid of my parents discovering me on the computer. It sure was great having my adrenaline spike every half hour or so whenever I heard my mother's footsteps on the stairs. That sort of dynamic is hardly conducive to creative work. Instead, I gravitated towards short-form games, and I mastered the art of Alt-Tabbing. That's how I learned to "maximize my leisure time." I rarely risked playing long-form team-based games with my friends (e.g. StarCraft, DotA) because getting kicked off the computer meant letting my whole team down.
My parents did not succeed in reducing the amount of time I spent on the computer. They succeeded only in causing me to associate the computer with feelings of guilt, shame, and resentment; they succeeded in convincing me that there was something wrong with me.
Look, I'm not a parent, so I am missing some perspective. I understand that parents are people too, with full-time jobs and myriad other responsibilities; they don't always have time to sit down and connect with their kids. Overall, it seems incredibly difficult to instill proper values in a child without also instilling some neuroses along the way. That is why I am able to forgive my parents. But forgiving them does not mean that I agree with their actions. They fell into the old trap -- "People fear what they do not understand" -- and their knee-jerk reaction was to treat me like a drug addict, subjecting me to verbal abuse, constant monitoring, and the occasional "this-time-we're-serious" intervention. You can do better.