Work
We run PCs at work because the app we need is an old DOS app written specifically for my line of work. When I made the purchase decision about what machines to buy, I held my nose as I bought the PCs. I considered making it work through VPC, but emulation is just so much dodgier than the real thing. It was the right decision. Other than that, I don't have anything I need a PC for.
The other thing, about PCs being tools...I get that, but I hope that people don't misunderstand--it is much easier to get most of my work done on my Mac. It is easier to use. I like it in a way I don't like my PCs, but that's not because of the culture thing. It is because it is a friendly piece of machinery.
A while back, people used to say about Macs, "Yeah, they're good to play around on, but if you want to get real work done, you need a PC." About 6-7 years ago, a friend of mine used his girlfriend's Mac to get some stats done. Coming away from the experience he said, "Yeah, PCs are good for games, but to get real work done, you need a Mac." He switched and hasn't looked back.
While PCs have caught up pretty dramatically in many areas, I just think it's easier to get work done on my Mac. There's nothing I need to do that's easier or better on any PC (with the possible exception of web browsing).
Chris