This is something I've noticed that particular to my new parish, is that the priest will lead either a decade of the rosary before Mass (weekday and Sunday Mass) or sometimes this is the Chaplet of Divine Mercy (on a Tuesday).
I feel a real strong sense of prayer and presence when I church full of believers are in deep prayer, kneeling and with their beads - me included! I find it so enriching to feel us all together as one Body of Christ really bringing our minds and souls into full awareness before Mass.
And today as I had to visit another parish for Mass, I dearly missed the lack of the rosary together before Mass.
How common is it to say some collective prayers before the Mass proper?