My iPhone SE doesn't have 3D touch, or if it does, I have no idea what it is.
So as far as I know, no, I don't have that option.
I think this whole argument just lends more support to the idea that Apple is being deceptive with this UI.
However, after all the feedback here I did some testing and it appears the GP was wrong: The submenu obtained by 3D touch/long-press doesn't actually turn WiFi off. My apologies for repeating his claim without backing it up.