I totally agree with you, hob.
I removed Windows entirely when I first installed Linux. Almost 4 years later, I have never looked back. Now, I had *nix experience under my belt (NeXTStep, IRIX, Digital Unix, a little Solaris), but not enough to help me with day-to-day tasks. With that experience, documentation, man pages, and lots of my own Internet research. I learned plenty in a very short time, and have kept adding to that knowledge continuously since.