We used to do it when playing Hall & Oates', I Can't Go For That, as that would start with a drum groove, followed by me and everyone joining one at a time after that; it sort of made sense. However, we haven't been playing that song, so haven't done any 'meet the band' shenanigans unless someone has had a particularly up front performance in a particular song. I think the band intro is a nice thing to do as it is a moment for the audience to appreciate particular members of the band who might not otherwise get any recognition, particularly the rhythm section (unless they sing lead vox as well).