I love my watch pocket! I wouldn't buy a pair of jeans with one. That's not hard to do though since only really cheap jeans don't have them. But on-topic, I do use my watch pocket for my pen knife. I've carried the same pen knife for over 40 years, every day, and would not be happy at all if I lost it.
On the off-topic statement though is that I don't have a pocket watch. Never found them to be handy since wrist watches came into being. Being retired though, I don't carry a watch at all - no need for precise clock watching.