I suppose I have a pretty darned standard usage case- I veeerry often go to channel tools, or occasionally Hbasms Stereoizer, on mono tracks that I don't want in the center of the mix but that I also don't want to double (especially not for VST instruments)
When I am using stereo imaging it's never to get the effect of doubling since recording a full-on double often give a drastically different sound than SM plugins - especially on instruments like brass which I do a lot of.
Too bad I don't have the legacy of experimenting with these tools back in the 80's and 90's like a lot of the guys around here :)))