I have never used a recruiter, but that doesn't mean I'm not open to the idea.
For the longest time I felt very uneasy about the idea. I think that stemmed from the fact that I'm an innately loyal person, so having someone looking out for opportunities on my behalf while I was in employment felt underhanded or something.
However, when I was at a role for 5 years and started to get itchy feet, a recruiter coincidentally reached out to me on LinkedIn, and I agreed to a coffee chat. It was good for me to get a different perspective on what pay conditions at the time were like, what kinds of roles were available, and also to think about where I wanted to head.
In the end I took a contract role referred to me by a friend, and began working for myself, but that conversation was a good jolt of reality that I needed. It's easy when you take a job that you love, working with people you enjoy the company of, to let go of your career aspirations and just enjoy the job. Which is fine, but it can result in you being taken advantage of by your employer, unintentionally or otherwise. Having a regular conversation with a recruiter can prevent that from happening. I don't actually know if that recruiter I spoke to was good at his job or not, but chatting to him was helpful.
Bit of a long-winded tangential answer there. I do get plenty of random offers via recruiters on LinkedIn, who clearly haven't read my profile. I ignore them.