There's more to using an SSD than just making your boot process faster. Someone who claims the opposite has clearly not been using one (for long).
Very much agreed. My main use of SSD drives is for non boot purposes on the desktop side. At my previous employer, the SSD was dedicated to any heavy I/O workload, usually associated with building or running a game. The only system I have that boots from an SSD is my work provided laptop.
And I have to say if a restore procedure from a disaster is going to lead to downtime measured in days, the backup process is flawed. If my SSD at my previous job tanked, I'd be back up and running in an hour, tops. If my main system boot drive in my desktop at home failed (currently not an SSD), it might take a few hours, depending on the speed of my restore off my NAS. Backup is more then just making a copy of your data, it's also about ensuring you have the ability to get back to work quickly when disaster does strike.