Why? Just because it comes in a pill form, instead of being conspicuous, doesn't make it any less of a help for a medical condition.
> I don't want to get addicted to another thing in my life,
The point of this comparison is that "being addicted to" ADHD meds is not in the category of "being addicted to heroine" - it's in the category of "being addicted to a wheelchair" when you could technically just use your hands to crawl around and grab things, instead of aiding yourself with technology.
> the idea of being on speed every single day seems pretty bad
Stimulant medication aren't speed, they're like "1/100 speed". It turns out that with medicine (not just psychiatric), the effects don't scale linearly or continuously with dose size. That's why those meds are helpful and safe to take in therapeutic doses, despite being technically dangerous, addictive drugs in much larger drug abuser doses.
> I seriously doubt most positive effect would persist after a year of using and rising tolerance.
Countless of people who have been treating their ADHD with stimulant medication continuously, for years or decades, will beg to disagree.
Nobody says you have to take meds for ADHD treatment, or that you have to take stimulants (there are other options available, although typically less effective). Hell, on some people with ADHD, stimulants don't work at all, or side effects are not worth the cost. But comparing them to speed is just wrong and irresponsible, as it makes people afraid of trying what could be effective treatment.