I haven't been in fighting trim for a few years, but I have, in the past, spent a considerable amount of time in the gym & at the workplace with anabolic steroid users. Also, socially with a few, but not as much as the former settings.
I think 'roids are analogous to an automobile(1). Most folks have the anabolic hormone equivalent of a Honda Accord or Chevy Impala. Enough to get the job done, but nothing spectacular. Roids are like moving on up to a more powerful auto or hot-rodding your existing auto. Some folks have the ability or discipline to handle it with aplomb, others end up in the ditch.
Also, the saying "lean & mean" really does have some validity. In my own case, when I get lean past a particular point, my testosterone levels do raise a bit. This does not make a a roid rager or a lunatic. I do have a much greater capacity for aggression, but that doesn't mean I have to go off on people. Such a capacity is useful in many endeavors: sports, military, LEO, etc. Anything where pushing one's self hard might be handy.
Anabolic steroids & corticosteroids steroids like prednisone are different critters. I have seen some obvious anabolic steroid side-effects that are similar, like water weight gain and developing heavy acne and oily skin.
(1) You can easily substitute motorcycle, horse, firearms, or whatever might have enough power to get one in trouble if used incorrectly.