I agree with you, but I think there is enjoyment in getting a deep understanding of one area and having a plan can help you do this. Instead of walking around it can be fun to climb a mountain or go for an over night hike.

For example if you want to get stronger having a workout plan can help you get that goal. Going to the gym and do whatever will keep you in shape and if that keeps you motivated that's great, but some are motivated by doing something they can't do right now.