This kind of comment really annoys me.
CLI: You need to memorize at least a basic set of commands. There is contextual help once you know those commands, but there is no help to find out which commands do what in the first place. Clearly intended for what we now call power users.
Win9x/NT4+ GUI: All required operations are discoverable through reading what's on screen and going through the menus. No manual or googling required.
Mac since OS1/.Net GUIs: Even better, hotkey commands can be discovered in the Menus -> users can learn how to become faster while just using the programs.
OSX since 10.5: Any program on your HD, installed or not, and any operation within these programs can be discovered through system wide search, clearly indicated by the search symbol staying in the top right of your screen as well as the Help menu. Typing after clicking on Help will even point out the command's placement in the menu such that you can memorize for next time.
Win8/Ubuntu: Trololo who needs discoverability - let's hide most of the functionality behind non trivial gestures (we heard people like them on Macs[1] so let's go all in on them) => the UI now has similar discoverability properties as a CLI - you need to read the manual or google a tutorial to get started.
[1]Note: There is currently exactly one gesture that is really needed in the default settings on OSX (which I find a bad idea btw.): Two finger scrolling.