As a guy with butt-length, naturally straight hair, I can tell you from personal experience that straight hair can be a pain in the butt, too.

The problem is more.. I don't know the word to describe it - texture, maybe? Thickness??
My hair, despite being totally straight, is thick - but also very fine. It gets dry easily, and looks "frizzy" if I blow-dry it - so I have to let it dry on it's own. Which takes
AAAAAGES due to how thick and long it is. It also gets tangled in a matter of minutes..
And even though I've witnessed how much of a pain curly hair can be, I'd still love to have naturally curly hair.

And I'd like it to magically stop growing at a certain point, because I hate having to go to a salon to have it cut. (which is why mine is so long)