ADHD impacts many people's most basic functioning. Routine chores like laundry or dishes pile up, you lose tools you need for the task at hand, you forget to do things that are necessary to maintain your health, and more. ADHD also has adverse effects on emotional regulation that can cause interpersonal conflict. None of these things would be alleviated under a different economic system.
We tend to focus mostly on the productivity gains of medication, but anyone who takes it will tell you how much it's improved their personal lives as well.
Straightedge is a punk subculture, so if you're not into the music then I wouldn't use the term.