Yes, the problem that I've found is that I've taken over legacy applications (several times), where the previous developer wrote comments/instructions for how to work with a method. And I wasted countless hours trying to follow their instructions, just for it to turn out that they had changed the method and never updated the comments. So the time wasting component can work both ways in my experience.
If that were an isolated incident I would blame it on the individual developer, however it's been a constant trend in the apps I've taken over through the years.