Also decoding mp3 files (for burning audio-cd for example) gets little better quality with fpu version of decoder
But basically I'd say raytracers are the most important thing you might need fpu for. I just had to buy FPU for my ram expansion card when I bought my first a1200 in 1993. Just that I could use Real3D and Vista Pro. And I've had FPU always since then. 68881 (mbx1200) -> 68882 (b1230IV) -> 68060 (built-in).
