rory, I've been re-reconverting a lot of my "stuff" to the BSDs (Free, Open, Net). It's refreshing. The Linux every-tool-has-to-be-a-swiss-army-knife ethos is exhausting after a while. The relative simplicity and clean organization of *BSD (especially OpenBSD) re-affirms my fondness for UNIX-y things.
You might think there's not that much difference but, in many cases, I'd rather admin a BSD box. Try it, you'll see.
Also, NetBSD is soo lean, it has made my old Pentium III almost useful again. Even with 333Mhz and 128 MB of RAM 🙃