Not at all!
After all, there are plenty of free GUI-based tools, and even free tools for Windows (including SDCC, of course)

In very many cases, a command line is a very cumbersome and difficult-to-use thing - it's just not the natural way that people work.

When you go into a shop, they don't insist that you quote the stock number before they'll serve you - you can just point and say, "one of those, please"
A GUI models that approach.

In many ways, a GUI is a far more convenient approach - and it's a convenience that's worth paying for.

Of course, a GUI is not suited to every task, and fear of the command-line will certainly hamper you.

As ever, it's a case of knowing all the options - and picking the most suitable one to the specific task at hand.