Everyone does it, is that all they know?
I haven't experienced it being a problem yet, try switching servers if it becomes to annoying.
I personally never use those two. As for the backslash I've never been in a place where I could use it.
I dont personaly mind it as i know how to counter it, but you gotta be able to use it to be able to survive in jk2 these days, because every one uses it so much.