The funny part is that "English" is barely used in an order at Geno's.
"Cheesesteak, Whiz, wit" is an order for a Cheez Whiz cheesesteak with onions.
Now, I'm a Texan, and as such my meat sensibilities are far more honed toward BBQ and tamales . . . but what I have experienced of cheesesteak sandwiches suggests that the "steak" part of the title is relatively accurate.
That given - at the very least, that the steak in cheesesteak is decent meat - why the HELL would anyone pollute it with the abomination that is Cheez Whiz?