The only thing I did was find the hiring managers for jobs I was interested in, but to be honest you don't even need premium for that. It's blending more and more into some generic social media monstrosity and wild west playground for recruiters to spam you even when disabling the option for hearing about new opportunities.
Dunno about premium, but as an infrequent user, I get the impression that features that used to work, now require an upgrade to premium to activate.
Based on my perceptions, I won't be upgrading to premium.