I use my Amiga for everything I do with a computer except the occasional video or website that it won't do. Also, I run CADCAM software on a peecee. Oh, and I have Sparcstations for mundane internet services, and the occasional use just because I have so many.
I used to do audio production, and some music synthesis, I do a lot of programming (this time of year), I have a Toaster setup to play with. All my financial work is done on an Amiga (more than you think!). All my email and internet browsing. Website hosting ( a little ). Oh and yes, all office type work. And, I have several network printers that my Amiga is really the only computer accessing them. I can't print from Solaris!
I even have the toner cartridges in my color laser printer loaded wrong due to a bug in TurboPrint.
Any graphic work I would do is strictly Amiga. Every once in a while I do a lot. I use Provector and ArtEffect a LOT. I still like Provector better than I liked CorelDraw, and I haven't had a copy of CorelDraw since I ran it in Windoze 3.0.
I used to have a really nice DooM editor for the Mac which I ran under emulation on my Amiga (it worked better than a real Mac) and we would play a lot of network DooM on Amigas. And my Amigas aren't even milspec, I don't think.