I'm the only guitarist in the band
I run two different amp models, one panned hard left, the other panned hard right
my backline is stereo.. both cabs are mic'd..
on stage I personally get that wide / fat stereo tone
last time I looked at the FoH mixing desk my channels were panned apart but not really wide
the effect of the 2 channels out front is generally very good when the two amp models blend..
to be honest.. I don't ever recall my two channels being panned on top of each other in mono..
the only truly stereo effect I use is reverb cos it's smoother to my ears..