That's what is great about this bulletin board. Other folks will read your first timer report and learn about this condition and maybe recognize it if they see it themselves. Might even save a life.
I have not seen HACE myself on Whitney, though it does occur. I have seen very serious AMS that could have easily progressed to HACE. In fact, every single summit climb, I have run into people with very bad AMS who were making bad decisions (e.g., to continue on). Ignoring AMS symptoms is how you get HACE....
I did see HACE on Kilimanjaro, including a guy who was being led down the summit by two porters because he could not walk on his own. His legs just kept going in all directions and then buckling under him. The porters had to support his weight and direct his movement.
