I also work with windows based machines and am fully satisfied with it, but I digress (that could deserve a topic on its own).

To first answer azk, I consider freebsd, openbsd ans sysv to be too complex as well, as there is too much abstraction between what you write and what is actually done. I'd head more toward things like runit or daemontools, where you can guess how to configure things on your own, without bothering about how it works internally.
When you got the following arborescence:

It's easy to understand how to create a new service, as the content of "run" is simply

easier than anything else really. No complex variable, no surprise on what will run, no hidden framework to source... Just a shell script, that you can run on its own to test it