Also, as a long time BSD fanboy, I've never considered OpenBSD to be a desktop OS. It's a great OS that I use on routers and servers, but never a desktop. I had a period where I used FreeBSD on my laptop but once I went Linux, I never looked back.
Also, I'm surprised: I'm actually thinking about leaving Linux to put FreeBSD (or OpenBSD?) on my laptop (Linux is just too unstable and base utilities change non-stop: ip(8), iw(8), ifconfig(8), iwconfig(8), dhcpcd(8), systemd...)
As the other two commenters said, you must be thinking of doas. Doas isn't a rewrite of sudo, it's an entirely new program with a different goal: capture the most common use cases of sudo and do away with most of the complexity to support the more involved scenario. This is a pretty common pattern in OpenBSD actually: provide the simple tool by default, let power users install the more complex tools if they need it for their work.
You're thinking of doas, perhaps?
http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man1/...
FreeBSD on the desktop is not a pain!
The correct way to get started with a new OS is to first try it out in a virtual machine. If you find that you enjoy using it, buy compatible hardware and go metal.