Personally I think Linux distributions are clumsy and still not user friendly. I can easily get by with using a given Linux distro (or BSD) for a desktop, but I'd hate the extra hassle that it entails.
Linux has reached the point where it's really easy to install, and often it's a smoother process to set up a Ubuntu install than a Windows install on the same hardware (supposing you don't have hardware out of the ordinary or want to use media center functionality, play back media in non-open formats etc), but once I start using it for my everyday work, I always end up spending more time figuring out solutions than getting work done - and I've used Linux and BSD on and off for about 12 years. In later years I've changed my usage pattern, so I install Linux to play around with instead of getting work done. That works for me.
MorphOS, on the other hand, installed nice and fast, and while the OS lacks a central repository (like OS4 Depot for AmigaOS 4), it's still easy enough to find software for it. Mind you, I'm not using this as my main OS either. I would use my AmigaOS 4.1 machine, if I wanted work done, but it's still a nice OS, and I've set it up so I can use it as an internet terminal in a living room. The Mac Mini is perfect for hiding away, and MorphOS boots so fast that my 3G router is online just after MorphOS has hit the desktop.
There is lots of free software (including some you are used to on Linux) and if you know your way around Amiga software, this is a great way to run it. Aminet is still full of software, and now that there are decent browsers (OWB, Sputnik), SSH software (SSHCON), nice mail clients (SimpleMail, YAM), excellent IRC clients (Wookiechat, AmIRC), graphics tools, music players and video players... really.. what more do you need for home use?
I've switched to Google Docs, so an up to date native office package is no longer a priority.