Yeah that qualifies as Damn Lucky....
I've been plenty lucky through the years but your story actually reminded me of a story about my sister.... Many years ago, I'm thinking it was 1973 she was living in Houston Tx at the time.. Driving on a freeway, similar to you, she suddenly felt something in the steering but unlike you she wasn't aware enough to just slow down... She though she'd grab the next exit as she was in the left lane of a major freeway.... Well the car didn't want to wait that long, it didn't want to go right either... It made a gradual left turn down the only left off ramp anywhere in the city of Houston.... Same deal as you, the pitman arm had separated... Towed to a shop, Guy raised it up & basically told her she must live a blessed life...