I actually got my degrees at the same time, as an undergraduate double major. So unfortunately, my experience is pretty different from what you’re looking at doing. I entered college as a Plant Bio major, with an English minor, but I’d been wanting to be a double major anyway, so eventually switched to doing both. I’ve always wanted to be a writer (and I’m an avid reader) but I also love biology and, of course, plants.
There was definitely a distinct difference between my science and my english classes, the former being larger lecture classes, and the latter small seminars. Let alone the difference in content, and the skills and thinking required. But I loved having the contrast, since I’ve always been a left/right brain split type of gal. It was nice getting some creative writing classes alongside my classes on plant physiology. So I can tell you that it is rewarding and engaging to have experience in both worlds, though I can’t give you advice on the logistics of getting a second degree.