I have to agree with the sentiment in most of the responses to the OP. As a professional with specific skills, I moved from the private to the public sector for the specific reason of helping to wind down towards an early retirement - in other words, literally a working holiday. I found that my technical skills were not appreciated nor wanted in some cases, because my approach is a business-like one - to streamline processes, help to make staff more effective, productive etc. As this is totally against the ethos in the public sector, I took the back seat I was offered and coasted to retirement. Like the OP, the reduction in remuneration was largely offset by the very restful days at the office - no pressures, no worries, no challenges, much shorter working days, long holidays etc. etc.
Maybe it is your attitude that's the problem.