I also intend to run all summer, at least for DHW, and eventually maybe pool water. This decision is made easier by the fact that I currently have no other way to make DHW.
The members of the "minimize the size of the boiler" crowd might be horrified at the prospect of having to keep a big boiler going for such a comparatively small load, but to me the jury is still out. The boiler is running without a timer, is pretty efficient and makes DHW via an indirect. And if I tried to shut it off, cleaning it for a summer shutdown would be a PITA, and, besides, I don't have enough light bulbs to keep the inside of it warm.
If the coal consumption turns out to be unreasonably high, I may try to do something with a smaller stoker boiler for off-season loads, but I think Rob has raised some important questions. What do the hand-fired people do in the warm weather? Are they such "manly men" (apologies women running hand-fired equipment) that they take cold showers all summer? Without actually trying to answer such questions, I'm happy that a stoker boiler (generally) provides the opportunity to run year-round.