Do you see any lasting benefits from your experiences? I personally still struggle with focus and attentiveness, especially when the demand is external. I haven't concluded whether I wasted my time, or if I need to get back to meditating. It's time-consuming!
However, I feel like the retreats were a positive for me, albeit not in the same way that meditation might be. Sitting, walking, and doing "work practice" (the term they used) mindfully gave me a great perspective shift. I found doing dishes truly enjoyable and worth my effort even if it wasn't changing the world.
Maybe I enjoyed it so much because of my personality. Or maybe the retreats helped me appreciate silence and downtime, thereby changing my personality. I can stand in line at the grocery store without needing to be entertained by my phone, which is a herculean effort for many people I know. It's too hard to say :)
The point of it, beyond contributing to the greater community, was to do these chores mindfully. There was no higher spirituality to it; just be present. When washing dishes, I was only focusing on washing, rinsing, drying, and putting them away. When sweeping, I was only sweeping the floor to collect dirt. When I collected the dirt, I was only collecting it. And so on. It sounds a bit silly, but it was a tremendous practice to force yourself to only do one thing and to think about that thing while you're doing it.