I was in a Bon Jovi tribute band for a period and, for some shows, we used back projections that were relevant to the music so, for some songs, used a click track. Also, for some songs, we used backing tracks that added a layer of BVs or maybe the odd sound effect or extra guitar - just to beef it up a bit. So, again, used a click track. Some songs we just played bareback. IMO it made us a better band, putting on a more polished show. But I wouldn't dream of doing it at the Dog and Duck with my blues rock trio. I think it entirely depends upon the type of music you play and where you are playing it.
@diskwave how old are you? I'm curious as you are always harping back to how much better music was in the old days but I suspect I am actually older than you yet don't share your views.