Yes. After a year(ish) of lurking with no account, and 130 days of having an account here, I have finally settled down to a state where I type out at least 1/10 the comments I think of, post at least 1/5 those I type out, and leave the majority of those undeleted!
And after working with my current co-workers for a few months, I finally have courage to say something once in a while.
But attrition doesn't work in most social settings... It's a difficult way to make friends (though the friends you do eventually make are good) - I made one friend in 4.5 years of college. And it's downright horrid for getting girlfriends...
I have many of the same feelings and the only difference is I've learned to deal with it.
I think part of what wasn't communicated in the article was that those tendencies don't necessarily go away. People just learn to cope with them better. Or at least that is how it is for me.