All of this is spot on, especially the second point. As someone who lives with ADHD, TDD is hell incarnate for my productivity. 'Lets write a test for what will be an Observable and account for for failing, passing, bad data, empty data sets...oh wait, what was the original task?' It's so unbelievably monotonous that it's REALLY easy to lose track of the original task and worse, sometimes I'll be doing something and think up an additional or better way to accomplish something, it creates real-time tech debt faster. My SO has OCD and to see the ways we think in action being so different makes it super clear to me that things like TDD probably are heaven for some people.
I have ADHD also. I find TDD to be very helpful, as it encourages me to break the problem into the smallest possible next step.
That said, I've found the most boost from the full XP menu -- pair programming, TDD etc. I can get a lot done with halved daily ritalin intake vs working alone.
