Let's face it. Perceivers are recognized by poor planning, tardiness, unfinished projects... We can counter this image by words such as flexibility, and by calling the Judgers too uptight.
Still, in real life, I almost only realise I'm a P when I forget appointments,...
I don't want to complain. I don't want to theorize about it.

I want some real-life examples where you were thankful for Perceiving!

I'll start:

Yesterday, five minutes before I had to leave for school, I got a phone call. It was from another school asking if I could teach some lessons there.
"I'm sorry, I have to leave now. But I'm in City this afternoon, maybe I'll pass by around 4pm?"

Yes, I've done a job application without any preparation