I'm sorry what?
It's "easy" for someone with 8 years of Mandrake experience to switch to kubuntu 11?
Now, someone with 8 years experience of 98/XP would have it "hard" when migrating to Windows 7?
I love the fair and biased comparison here. /sarcasm
An "End-User" is _ALWAYS_ going to have a difficult time migrating, regardless of the OS, however any technically savvy "computer person" will be able to make either migration easy.
I don't know about you, but in both Linux and Windows, I learned by messing around, be it clicking on random tabs / buttons / icons or typing commands with random arguments.
Someone who used Mandrake for 8 years is NOT a "end user" and never will be. However, that person who used 98 / XP for 8 years is _MOST LIKELY_ a "end user"
Your whole "User Friendly" rant is pointless because you are writing about points that matter to YOU. That married couple down the street may want to be prompted for a password, and may "need" the AV software.