I have switched from OS X to Linux, and trying to get used to the different keyboard shortcuts in IDEA. One very important thing I cannot find is "move cursor to beginning/end of line" (Cmd-Left and Cmd-Right on OS X). Also looking at the reference card doesn't reveal anything useful.
I'm not familiar with IntelliJ, but in most of the editors you can simply use the "Home" and "End" buttons for that.