Like Alan noted above, my 24-70 is always with me if I am on a photography outing with very few exceptions. Most of my outings are for nature photography.
Never thought I would say this, but here goes...if I could only have one lens for the rest of my photography life, the 24-70 would be it. I can create/capture a lot of nature stories and memories with that one lens.
If you need it, or want it, for your photography is an open question and personal choice. Good question.