If you use WinUAE (exclusively, you have no Amiga hardware) what do you use WinUAE for?
Well, I do have a couple A2000s and A500s in storage (the A2000s need some restoration), but I use WinUAE almost exclusively. A lot of it is for productivity work.
1) music composing: Bars & Pipes, OctaMED, SoundFX
2) graphics: ImageFX, DPaint, Brilliance
3) 3d rendering: Aladdin4d, Lightwave
4) game playing: anything really
For graphics work WinUAE blows away any real Amiga I've owned because I can work in super hi-res (1920x1080) and it's much, much faster at rendering effects/frames than the 68040 I had. Also I can configure a "virtual Amiga" with 1GB of RAM, etc.
Another great thing about WinUAE is I can setup multiple "virtual Amigas" so I can have a OS3.9 "modern classic" system and another OCS WB1.3 system, a KS2.05 system, etc...etc...etc...
This is very useful for very old applications or games that choke on different versions of the chipset/OS.
The last great thing is that I can have a shared folder between Windows and AmigaOS....so for example, I can save a graphics from ImageFX, flip over to Windows with a mouseclick and load it into a Windows application or vice-versa.