"It would be nice enough for making pasta and such, as I would only have to lug the pot one direction, but pasta making wouldn't be enough for me to want one. But when I have my big canner fired up and am making 8-10 dozen jars of jam that all have to be boiled-a potfiller would make a huge difference for me. And when I am making stock in my big stockpots, it would also be a nice thing not to have to haul the cauldrons stockpots across the room when they are full of water (right now I ferry water back and forth, but it takes quite a few trips as my stockpots are big)."
If you don't mind the fact that it looks like a bit of a kludge, you can get a plumber to attach a tap under the sink, attach a small hose with a hand trigger (make sure it's long enough to reach the stove), and store it under the sink. When you're working the canning, you can drag out the hose to fill pots without requiring a big plumbing job.
"I don't have an authoratative source for it. That's just how it was explained to me a few years ago when I was remodeling my kitchen."
I suspect that Fleur-de-Lis was asking for a source to back up "But you know, for most people who install one, it's not about the purpose, it's about the look." That statement does sound dismissive.