I would agree partially with the statements Johnson made there. For computer games he might be quite right for some genres. Thanks to Sierra's older parser-adventures (KQ1 etc.) my english vocabulary was greatly improved and made lessons at school quite easy for me. I would not say that Sierra taught me English, but they helped a lot
Some others like trading simulations and strategy games formed my life, as I believe they had some influence to my job preferences nowadays.
But sometimes I wonder, if today's games have the same effects. Thinking of the widely beloved FPS, I can't really imagine these games can do something good (except improving the mouse hand's reflexes and lowering the violence barrier). They can be fun, however.