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I've never had to directly deal with a fire, but after an incident where a roommate took the only extinguisher in the house when he moved out and an electrical short from an old crappy dimmer switch, I'm big on having a couple on-hand.
I also have way too many hobbies involving stuff that can easily catch fire and they're so cheap that I have multiple on each floor. 2 on the upper floor where my sim-rig, 3D printers, reloading supplies, and electronics soldering bench are. One in the kitchen and one in the master bedroom. 2 in the garage (excluding the one that's mounted in my old MG), and finally one in the basement since there's basically nothing down there.
We only have the one, but it's in the laundry room, close to, and roughly equidistant from, the garage with the woodshop and laser engraver, the office with the 3D printers, and the kitchen.
I take the "Two is one, and one is none" mindset on it. I don't think most people need to have 2 on every floor like I do, but I still would be very concerned about having any sort of shop and it not having its own dedicated extinguisher. I've got the little 2.5lb guys in the house, but I want a 10lb'er anywhere with fuel sources. They're so cheap and take up so little space, I really don't get why you wouldn't want more than one.
I've never really had anything more than some brake cleaner residue catch fire or a flare up in the kitchen, but it's just such a cheap form of insurance that I'd rather have "too many" than too few.