They don't have a rwy 9, they have 9L and 9R. Review your airfield diagram before your arrival please.
When you fly in to KORD you need to bring your A game. Sounds like you don't. Its truly one of the busiest airports in the world, if not the busiest. Not sure where KATL sits on the list.
"London Heathrow is one of the worlds busiest airports"
Not even the busiest in Europe let alone the world. However, it is busy.
"I feel that ATC in terminal areas are trying to kill me (I'm not exagerating)"
Again, just DON'T COME HERE. Bid around it if you find it so bad. If you honestly think it soo dangerous, you have a responsibility to your pax not to fly them to the USA.