Aaaah yes I love all things personality descriptors and psychological insights. I first did it years and years ago, and like you I always maintain a balance of openness and scepticism, however I really like the myers briggs types. I feel like it acknowledges that different parts of your personality has an affect on the other parts, which is sometimes lacking in other models.
I ran it at a team building day for work (like I think most people do ), and we used it as a practical tool to improve things. Considering which types would work best together, what was needed for specific areas of our work etc. It actually worked really well and I think overall helped people to understand one another more! It was also really interesting to see what people predicted they would be before taking the test, in comparison to what they were afterwards.
I’m an ENFJ and most of it is so accurate to be honest. I’ve taken it quite a few times and always end up with the same thing. Initially, I was a bit taken aback by the E though - I always viewed an extrovert as purely someone who wanted the limelight all the time (which definitely isn’t me) but reading up on it more gives some better understanding. I think the newer add ons (-T or -A) help to explain the nuances a bit more too.
It has definitely helped me to reflect on what makes me act in the way I do and how others may perceive me etc. I think as long as you don’t rely on it, it gives you a really healthy awareness of both yourself and other people in general. I love knowing what other people are, I find it so fascinating.