Yesterday I subbed for one of the cantors at my old parish where I was a regular cantor a few years ago. It's a large, suburban parish with a newer building, built within the last 25 years. It's a "church in the round" with the organ and choir risers right up front beside the altar, exposed for the entire congregation to see. (it's one of the reasons I hate not having a choir loft.)
Also, from both the cantor podium and the Ambo I have a perfect view of the doors to the Church. (This is the other reason I hate not having a choir loft.) I get to see the parade of latecomers--some coming in as late as the homily. Before I go on, I am well aware that everyone, including me, has been late one time or another to Mass; we don't make a habit of it, but sometimes it just can't be helped. I'm not talking about those few people rushing in clearly out of their usual character.
I'm talking about those several dozen individuals and families sauntering on in like they were at a casual lunch buffet. The worst was the one in flip flops, fwap-fwap-fwapping in as Father began his homily. From right up front there, for as long as I can remember, it was the same faces over and over again. Similarly it's the same issue after Communion with the dine-and-dashers.
I notice this when I'm in the pews, too. My husband and I occasionally attend the 5:30 pm Sunday Mass, and are just beside ourselves at how many people--all the same ones, by the way--trot in late then. You mean you can't get to Mass on time at 5:30 PM?? Mass times don't change. Church buildings don't randomly move every week. What in this world is so much more important than worshiping your Lord?