I think they're quite lame. Always touting Linux on desktops when they know it's not ready for prime time. It's still command line hell. Linux is like that program, GIMP. Powerful when you know how to use it, but it looks ugly and feels cumbersome. These fanboys want to topple Windows as the OS of choice but when some clueless newbie tries to ask for help, most of the replies is "RTFM". I'm sure in an alternate universe that's one why to get more users.
On the subject of programs, it is so annoying to see these fanboys go on forums for Window apps and beg for a Linux port. If said program is open source, I just want to yell at them, "The source is right there, port it your damn self!"