At the parish to which I belong, which has a rather large church building, it is still done that way for every Mass. And most of the Masses are not even Extraordinary Form. It is indeed efficient and quick.
I’m always amazed when I go to a church where there are 3 or 4 priests listed in the newsletter...and only the celebrant will serve Communion.
Priests used to spend all Sunday morning in the church, either celebrating Mass or assisting the other priests (this was before concelebration, btw) - and then they’d have the big Sunday dinner at the rectory, usually followed by Scotch provided by the pastor...
But that was a different world, I guess.