We'd expect the brain scan of someone who had never played piano to look different from a later scan after they learned to play piano.
So, a problem I have with this kind of article is that by concentrating on words like "disorder" and "remission", they kind of imply a passive response.
Learning to control yourself is an active process, and once you're at the level of the median person, do you have a disorder, at all?
Turn off the idiot boxes(TV, Internet, video games) and go do something tangible that requires action instead of passive observation. It's amazing what can be achieved when you're not dulled by sensory input overload. Be warned, this is not the path of least resistance, it will take EFFORT!
edit:stuff
it will take EFFORT
In some ways, that's like telling a person suffering from a growth problem to just make the effort to be taller rather than taking growth hormones. Maybe someone with a spinal injury should just make an effort to heal. Maybe someone with Parkinson's should make more of an effort not to stutter and twitch.
The reality is that many of the behaviors you'd like to believe are strictly efforts of will are composed of complex chemical interactions in the brain that can be hampered or helped with the addition of other chemicals.
Some things can be altered through effort, but completely dismissing the proven medical condition some people suffer from is inappropriate when discussing matters of the brain.
FTFY
As for chemical imbalances, yup, many suffer from extreme divergence and undoubtedly need therapy and meds. There are, however, a lot of 1st World hypochondriacs and lazy folk, as well. People who sit sedentary for large blocks of their daily life consuming input that requires little effort and yet gives them a sensation of drama/humor/fear/lust is absolutely consequential to how their brains develop over time. I'm yet to meet an ADHD person who cannot muster the will power to never miss their "shows" or spend countless hours with a game controller in their hand...
That's a lot like telling someone who is learning to walk again after an injury that they don't need those fancy "crutches" or "slings" that pansies use - people with real gumption just hop out of bed. If they break their noses a few times along the way, they just need to remember that they aren't taking the path of least resistance, and that it's a sign that they aren't weak people.
I'll probably be starting medication management in about a month, after 31 years worth of trying to make it work for myself. It was manageable previously because I had lots of structure provided to me to lean on - from school, from bosses, whatever. Now that I'm the one providing structure for myself and others, I've found that I simply can't function. I've tried for three years to self structure with all the self-help you can think of. I don't want to be medicated forever, but I really need something to help me focus just a little bit so that I can develop good habits.
An important factor is that differences are objective, but disorders are to an extent subjective and socially relative.
I.e. 20 years ago I was a guy with ADHD who was having trouble concentrating on school. Now I'm a successful creative with hit products on the market. Yes, I've definitely developed new skills and damped down bad habits, but part of my success has been to choose a playing field where I have the advantage.
Finally, I should say that there's no silver bullet (not even turning off the "idiot box", etc.). For me, it's been a slow accumulation of skills, weeding out of bad habits, picking my battles, and fixing sleep problems.
An ADHD diagnosis can be helpful initially in that it connects you with a body of things to try out. I think it's important to move beyond that label, eventually, but it's a gradual process.