We swapped most of our linux and vmware platforms to Triton and SmartOS and been loving it ever since. Obviously there's still need to run linux in bhyves due to some specific software (e.g. docker) but generally services are on either lx-zones or smartmachines. It just works.

I am pretty sure my IT department is transitioning to Nexenta which is an illumos.

Company before last was using some Solaris+nexenta.

Samsung has an enormous smartos deployment that would rival all of Azure. (Based on what I learned about Azure)