For what it's worth, using the viewport meta element to disable zoom is a WCAG AA accessibility violation: http://www.w3.org/TR/mobile-accessibility-mapping/#zoom-magn...
That is exactly what is disabled when authors disable zoom via the meta property.
No solution is perfect, but allowing zooming is simple and a huge win for me. (Even if the site still has a sticky header that wont get out of the way...)