I turn 52 today, so early retirement isn't an issue on the radar yet, but one thing I think might serve a lot of people well is something comparable to Dan Fienen's situation, though hopefully not related to conflict but to simply slowing down with age. A pastor can still serve in the same basic capacity but at a different level of energy demands. One alternative would be the small parish that can't afford a full time pastor. But another might be team ministry in a place that has a strong senior pastor. Part time doesn't have to mean small parish.
I could easily see myself going either of those routes down the road. A key thing Dave said upstream is, "It's tougher right now due to the virus and the way things have changed..." Covid has been a big stressor, but the way things have changed is an ongoing stressor. The church of the future will need the wisdom and perspective of age, but probably the institutional leadership of the young. Sometimes burnout is avoidable if you take a step back and do something a little more focused without being responsible for everything. Was Ed said about the strain of being "the guy," the one in charge of and responsible for everything, is something you can only do for so long. It has nothing to do with preaching and teaching and visiting or serving the Lord by serving His people. It has everything to do with the energy of keeping fifty details in your head and making all the decisions, as well as not requiring the energy of translating all your basic assumptions and outlooks into a new world. Pastors approaching retirement age are increasingly strangers in a strange land, and that takes energy. Soon, a church might be better served by a younger pastor who grew up with the outlook of "the ways things have changed" but advised by an older and more experiences associate pastor.
My idea of early retirement would be phased. Right now I'm the senior pastor of a pretty substantial operation, but the things I enjoy about pastoral ministry and think I'm good at have little to do with the added responsibilities of being senior pastor. In eight or ten years I could see myself serving here or at a similar place but as an associate or in a part time capacity, easing into retirement by taking the burden of administration and decision-making away and leaving Bible studies, some preaching, visitation, or perhaps some focused aspect of ministry (just not the comprehensive whole that Ed talked about). Or going to a much smaller church as a full-time or part-time pastor. I can't picture ever being totally out of ministry, but I can picture becoming a liability without knowing it, and would choose to ease into retirement, whether early or not, rather than having a last Sunday and waking up Monday retired. But as we know, a lot can change, and quickly, and looking more than a month down the road is trickier now than ever.