Right here.
I can, for example, play Quake in OS 3.1 under WinUAE on a moderately powerful PC and get framerates wholly unattainable on any amiga.
More practically, Lightwave on an emulated Amiga setup positively roars it renders so fast.
I was never what you could call an "amiga" games buff; I mean I liked playing games on the Amiga but not some of those old chestnuts that most other folks seem to love so (lemmings, turrican, swiv, shadow of the beast, killing game show, Alien Breed, etc. etc.); more into sims (Gunship2000, M1 Tank Platoon, F16 Combat Pilot, Thunderhawk and so on), all of which were typically straight PC ports anyway. So going back and playing games isn't that big of a draw (to me).
The tiny bit of productivity apps that it's still fun to tinker with on the Amiga for me were real CPU hogs in their day and it's nice to run them through an emulator and watch, say, Vista 3.0 on the Amiga run at an absolutely blistering pace.