Nitpicking (or maybe educating?) but WYSIWYG is specifically editors that allow you to create things like GUIs by dragging and dropping elements rather than writing code. Most text editors allow you to change the font one way or another, but that doesn't mean they are WYSIWYG editors ("What You See Is What You Get").
The standard definition of WYSIWYG is a text editor where what you see on the screen (fonts and all) is what gets printed. Prior to the Bravo text editor on the Xerox Alto, this was not the case.
To join the (nit)pickin' party, I would argue that MacVim is WYSIWYG in that what comes out of the printer will look just like what's on my screen, minus the editor chrome that MacVim adds. IOW, if :set guifont=Courier_New:h12, then a bunch of code in 12pt. Courier New comes out of my printer.
