Herbicide-resistant GMO crops account for over 80% of total GMO crop area worldwide. There's a reason why people usually talk about both at the same time :)
Yes, but glyphosate and other herbicides have been used since before GMOs and would continue to be used if GMOs ceased to be planted
It should be obvious that no one plants a glyphosate-resistant crop without the express intention of spraying more glyphosate than the equivalent non-GMO crop can tolerate.