I just recently had my first junior developer assigned to me. Learning how to mentor, teach, as opposed to just getting a task done is harder than I imagined
I've had the good fortune to inhabit a mentoring position twice in my professional career. Both have afforded me opportunities to teach new people as each business expands.
I find mentoring incredibly rewarding. But I also naturally enjoy spreading knowledge (I considered a career change to teach history at the university level, but didn't want to pursue the academic credentials). It's not just teaching the tech that's rewarding. I also enjoy sharing time management techniques, tips for writing solid documentation, and pointing out how to avoid gotchas that I've run into in my personal experience.
What I absolutely don't want is to join the ranks of management. A buddy recently moved up and he now spends almost all of his time in meetings. When he isn't in meetings, he's responding to the many people who need his attention for one thing or another. I wouldn't find that the least bit fulfilling.
This is what strikes me as tone-deaf about the grandparent comment with regard to "loving your job." I love my job because it pays well enough, I like the people I work with, and it doesn't intrude into my "real life." I hated my former employment, where ambition was a thing, because it dominated my life. It paid far better, but I was unhappy overall. What I have strikes the right balance, and that's rare enough that I treasure it.