Many users open StackOverFlow and check the tags which they like the most. Since we have Favorite tags(which contains users favorite tags), it should be rather placed above 'Unanswered tags'. This way, users will be able to access the favorite tags easily. He need not grope through the big list of tags and go to his favorite area of expertise or interest.
You do realize that most questions (I would guess around 85%) on the Stackoverflow homepage are questions with your favorite tags? So you don't have to "grope through the big list of tags and go to [your] favorite area of expertise or interest", your favorite questions are right on the front page!