I was using an Amiga for MOST things up to 2008 (except modern web-browsing). Then my Amiga broke down and it would have cost just way too much to get it going again. Since then I've been using a mixture of PC/Windows and WinUAE. It's been great, but there are a few things that would have to happen to AmigaOS for me to be able to switch back totally:
- a modern multitrack audio recording software DAW (like REAPER)
- a modern non-linear video editing application (like Sony Vegas)
- a modern browser (like a port of FireFox)
I know there's Audio Evolution, etc. for the Amiga, but the CPU to run it was always out of my price range. Video editing software would take the same brute force, and as far as I'm aware, nothing like it exists for the Amiga in a software only solution (I know about the Flyer but that's hardware). The port of FireFox is almost there I think.