Nice post by Sue Pelletier on culutural biases against introverts. As one of these, I identified with her comment:

Being a hard-core introvert myself, I tend to get pretty drained from the stuff so many planners seem to thrive on, and need down time to regroup and re-energize (I wonder how many closet introverts we have among planners, who like me collapse after a long day of interacting with people?)