Jpegs (libjpegturbo), video decode/encode (libavcodec), encryption/decryption, ZFS filesystem, any workload that does high throughput. SIMD is the next generation of computing, without it we would have very very slow computers. Technologies like HEVC don't work well without SIMD, they're designed around it. Take a look into ffmpeg and see the tremendous amount of hand written simd assembly for various platforms.
All of them? I'd need a source on that. Also how do you think these algorithms became popular in the first place? If implimenting an algorithm around SIMD didn't give proper performance then they wouldn't exist.
You have to understand that current software exists because it solved a goal. If you have to first have your algorithm implimented in hardware then nobody can make anything. Without SIMD these projects simply wouldn't be able to exist. That's the hard math of it.
