I think the reason you like it is exactly the reason a lot of people hate it.
JIRA in its default state is fairly sane. People who hate it, usually with a white-hot burning passion, really hate the ham-fisted customisations their own organisation has done to it.
Why has this had adds playing every time I turn my radio on for the last 2 years as well..?
I'm not the previous commenter, but I also have a similar 30+ years experience, and I've used quite a lot of project management software. I've seen Jira used poorly, and used quite efficiently for managing projects. My current job uses Jira and nobody in the company has ever expressed anything negative about Jira, and it's become quite nice to use. But again, I have seen some companies absolutely fail at Jira. YMMV.
Given the option, I will always push for Jira, and associated Atlassian products.