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> BSD is a place where developers can experiment with different approaches to kernel design, filesystems, packaging systems, and more.

that is most certainly true, but I am wondering, has any of the work done in BSDs in recent years influenced linux development in any way?

Yes it has, just to name a few:

kernel: Wireless drivers, aslr, pf etc. userland: ssh, ntpd, carp, bgpd etc.

Nitpick: ASLR was first implemented by PaX for Linux. OpenBSD ported it from PaX a few years later.