Work is work, and many of us will always be working on one thing or another because it's just the way we are. I'd think working in a brewery would be more interesting and rewarding than a lot of other kinds of hard work, like pouring concrete or roofing. I finally was able to brew again Saturday, first time in 3 months and it flat out kicked my a$$, but I was really pleased that I finally was recovered enough to be able to return to doing physically demanding work.
As for ruining one's enjoyment of something by doing it for a living, I made a living [barely] as a Tinner for almost 30 years, but still enjoy making stuff with sheet metal, enough so that I have an 8' brake in the back room of my building. Some people can't stand work, some people can't stand to not work.