As a woman, would you ever tell a guy that you feel like you’ve known him for a long time and are surprised that you get along so well so quickly and mean it in a purely platonic way? Same thing with the extremely long emails— she’s so busy and making time to write to a guy friend that she met at a coffee shop randomly several weeks prior.

Yeah, I would actually. Most of my friends are male and my best friend is male. I would probably say those things without considering the impact of the other side. That's sort of clueless on my part, to be honest, but I would say that to a girl too without the consideration of male/female dynamics because I considered him a friend.