You don't want to use BSD on the desktop.
I'm not saying you can't, all the usual stuff is in FreeBSD ports, there are distributions like PC-BSD that attempt to be good for desktops out of the box. If you really want to make it happen, you can. I've watched many Linux and FreeBSD folks spend countless hours making their desktops work.
Even going to a hard core sysadmin conference, you're going to see a sea of Mac's, some folks even using Windows, and a smattering of the hard core on Linux desktops. Why? To work with other people in their company or at other companies they need Skype, or WebEx to work. They need Excel to open the quotation for hardware, and flash player to view some mandatory training. They want resource browsing that just works so they can print to a printer in the office.
The reason BSD is great in the data center is lots of people use it for that. It's a network effect. You're standing on the shoulders of other folks. It's the same reason Windows and OS X dominate the user desktop market, the software you need just works on them, someone else has made it work. If I told you to replace all of your data center servers with Windows 8 boxes you'd probably laugh at me, and yet the opposite question does not provoke the same response!
So if you want to, try. It can be done, with much blood, sweat, and tears. You might find that fun, if so enjoy! You might work for a small enough company or even just yourself where you can mandate BSD, and LibreOffice and be happy. If so, you are extremely lucky. Otherwise as a long term, die hard, FreeBSD supporter I can tell you from 20+ years experience, you're going to just frustrate yourself.