Ah, the pen tool. Some love it. Many hate it. This "elegant but demanding drawing tool" is arguably misnamed. Though it is capable of drawing strokes like a fountain pen, it is actually a powerful tool for highlighting and selecting content with almost complete precision. Because so few people have mastered the pen tool, it is a particularly valuable skill to have in your toolkit. There are some design shops that would hire you on the spot if you could prove that you know the pen tool inside out.