I'd love to know what kind of churches you've attended. I grew up in the Assemblies of God and various nondenominational churches, but also attended Baptist and Methodist churches, and have ended up in the Presbyterian Church of America. I've heard the Lord's Prayer recited in all of them.
Admittedly, the UMC and the PCA recite it more often than the Baptists and the AG, but I certainly heard it in all of the churches I attended.
How often? Under what circumstances?