I did learn a lot from school and got good grades but dropped out of uni and like you now working in a job I really enjoy in IT without a degree.
University and education in terms of work helps open the first door or two at the beginning of a career from what I have seen, after about 3 years in a job assuming that’s what you want to do and you have found your niche, I don’t think it plays much of a part after that. There’s obvious exceptions in terms of the medical profession and a few others like that but for most careers professional qualifications end up being more relevant and valuable. But at the same time there’s more to education then getting a job. Doing History and Economics A Level for example has taught me an awful lot about why the world is the way it is for example, hasn’t helped at work but it has helped a lot outside of it.
Plus, and I cannot emphasise this enough, university really is the best time of your life, and it was worth going as much for the education as the non-educational aspects but I only paid £1k a year in fees, £9k might well change that thinking.