Yeah, the reason I take Adderall is best summed up by the difference in my college GPA that occurred after being prescribed Adderall midway through. (Not to mention all the depression-like symptoms that came from underachieving constantly and knowing it and wanting to change that on my own but failing over and over.) And in the years since then I've gone a few months at a time without it to try to see if, now that I've got more interesting jobs, I still need it to focus. Sadly, it seems like I do.
But there are tricks to it. It has something of a threshold for me: after a certain level, higher dosages don't seem to help any more (other than the first day or two right after the switch), as my body builds some tolerance. The just make the side effects worse. And the side effects are unpleasant at best, even at the relatively low dosage my doctor and I have gotten myself down to. I would absolutely not take it regularly if I felt like I could get stuff done at a sufficient level without it. Some people need their coffee, I need something a bit stronger. Sucks, but I'm stuck with it for now.