Can't comment on FreeBSD but I run OpenBSD on my laptop and for me it "just works" (wifi, trackpad, display, etc.) but I did have to swap out the stock wifi adapter for a supported one. What doesn't work is suspend/resume. I haven't tried the latest -current yet though, which I did recently install on my desktop and finally got native resolution on my dual 30" monitors.

That said, things I don't do on my computer include playing games, watching videos and listening to music, so my definition of "just works" may not be the same as yours.