I don't think many people consider being depressed or stable crazy, and obviously pretty much all people with bipolar disorder spend time in these states. Really, manic behavior is also ill behavior, but sometimes manic behavior can appear as "crazy" to some people observing the behavior. I can also say thay I've personally felt what the word "crazy" represents, but only in manic or mixed states.

To me "crazy" connotes shocking or abnormal in some outrageous way, either scary or humorous.

I see the word "crazy" as sort of stigmatic at times. In general, it is best not to use it when referring to anyone with a real illness.