The only drives in my work machine are 3x512GB SSD's in a RAID0 array. This is to deal with datasets in the 300GB range that my code outputs as it runs on supercomputers (10,000+ cores).
When you're trying to make an animation that needs to read all 300GB serially through a file like that SSD's are a godsend.
Just last week I purchased a new workstation for tens of thousands of dollars (don't want to put the exact amount on here). It contains a 1TB "Revo" PCIE card (extremely fast SSD chips that plug into PCIE), 512GB of RAM and a Nvidia Quadro K6000 and a K5000.... all to accelerate this same workload...
Just because you can't think of workloads that would be useful with solid state drives doesn't mean they don't exist!