Is Professional Development a thing of the past for Educators?

I've visited my child's elementary school classroom many times and see how much needs to be accomplished in a day. Curriculum goals plus all the other learning activities (library, assembly, PE, etc.) means that the teacher is doing all they can to fit this stuff in the day. The school day is fully booked - and that's not counting grading and other work they do to manage their jobs... and it's a lot. Recently, my local district's teachers had an in-service day following the Labor Day holiday, which I'm sure was a full day of trying to take in as much new and review information as possible. Yet, there are still so many things for the teachers to learn and understand so they can continually streamline their teaching styles as well as come up to speed on how to become more effective with the technology tools out here. Time constraints don't allow for all the professional development opportunities to be taken advantage of. I've taught tech classes to teachers, meeting after school, but turnout is generally low. Is continuing education a lost opportunity for educators?