That is the exact same worn-out excuse as the Win-trolls keep on using, and it's bullshit. There are plenty of distributions in which you rarely — if ever — have to use a command line anymore. Besides, there are certain things for which you also have to use a command line in Microsoft Windows. And their PowerShell is just... perverse.
The problem isn't with GNU/Linux (or UNIX in general) itself. The problem is that people who use Windows have developed Windows habits, as well as completely erroneous beliefs about how a computer works, and that they're either unwilling or unable to let go of those habits.
If you take a person —
any person — who has
never in their life seen a computer from up close before and you sit them down in front of a Windows computer, then they'll have an equally hard time at best, if not a much harder time, to learn how to use Windows as they would if you were to sit them down in front of a UNIX workstation.
UNIX is logical, it doesn't use any fancy marketing talk, and it does
exactly what you tell it to do. Windows is full of fancy-sounding marketing vernacular, consumerist indoctrination, anti-competitive presentation of information, protection of proprietary products and so-called "intellectual property", and it only makes sense — remotely — once you've gotten used to how it all ties together.
There's an 87-year old man I know who sells computers, although that's only a market he got into in the early 1990s, because his shop had actually always been more about office equipment in general — anything from pocket calculators and typewriters over to fax machines and photocopiers.
He's a great salesman with a lot of experience in selling things to people, but he has always shied away from learning how to use a computer himself, because he said that if he were to get into that, then he'd become a maniac and he'd want to know everything there is to know about them. But a number of years ago he finally caved in, and he started using a computer for his administration.
He went straight with GNU/Linux — Mint, to be precise — and he's still using that very same system to this very day, without ever entering a single command. He primarily uses LibreOffice. And he's got an internet connection, but he never uses it. So he doesn't have a website or even an email address. He only uses his computer as a glorified typewriter. But he didn't find it very difficult to learn, because it all makes sense to him.
Surely you must already know by now how effective a bribe can be, and especially when dealing with government organizations? Microsoft owes 90% of its success to bribery and extortion, and the remaining 10% to lies and theft. Almost everything they sell was either bought or stolen from elsewhere and then rebranded.
That said, NASA uses a whole variety of operating systems. Its desktop computers are Windows machines, but its servers run GNU/Linux, as do most of its satellites and all of the Mars rovers. They also use embedded real-time operating systems — such as QNX, which is a small UNIX-style system — on a number of things.
Now, the US Department of Defense, that's a whole other matter. Most of their systems run Windows, and only the control systems on certain US Navy vessels run (a modified version of) GNU/Linux. And the rest of the US government uses Windows, because of Microsoft's bribery. And it's the same with most other western governments. Only a few have thrown Microsoft out and have begun adopting GNU/Linux. Because it's cheaper, more reliable, and more secure.