I don't go to conferences now, as I'm retired, but I enjoyed the ones I used to go to. I would only go to ones that were within my area of interest, and it was great to learn new things.
It was mandatory under the Law Society's Rules for a continuing practising certificate for me to attend a minimum 16 hour's professional conferences a year, and the subjects were always things I was already practising in, so it was either updating the law, or expanding my knowledge. If they weren't so expensive I would have attended a lot more. I was my own boss, and could certainly choose which ones to go to. I loved my work and was immensely interested in new developments and learning (still am). Occasionally I would also attend conferences in other subjects which only vaguely related to my work, but which were dear to my heart, like Human Rights.