If you want a level description of Presley's drug use, read Peter Gularnick's two volume biography. I'm not as familiar with Ms. Taylor, even though she was once married to our exemplary senator, John Warner. But I suspect what happened around her is much the same as what occurred with Presley. It has little to do with doctors feeding drugs to patients, but rather with patients trying to get doctors to feed them drugs. Don't blame that on the medical profession.
Most doctors are smart enough to get a second opinion on difficult cases.
My father is still called for consults to this day. But like it or not, doctors are human too, and do make mistakes, not all of which can be laid to hubris, as you seem to suggest here. To think every medical error is caused by some god complex on the part of doctors is ridiculous. Also, you are at the top of the hierarchy. You will get the finest health care.