Is Xcode useless for the common man?

Xcode is Apple's software development application. 

If you do not develop or compile software, use simulators, or have another specific reason to use it, you may not need to keep the full Xcode application installed.

Using Terminal does not, by itself, require Xcode. 

However, some command-line tasks or applications may depend on Xcode or Apple's separate Command Line Tools.

You can check whether Xcode is currently selected as the active developer directory by entering this command in Terminal:

xcode-select --print-path

If the result is /Applications/Xcode.app/Contents/Developer, Xcode is currently selected. This does not, by itself, mean that you need to keep Xcode installed.

Based on the use you described, removing Xcode.app may be reasonable. 

macOS itself should continue to operate normally, although a task or application that specifically depends on Xcode could be affected. 

The separate Command Line Tools, if installed, are not necessarily removed when you delete Xcode.app.

Avoid deleting other files simply because their names contain “Xcode” or “Developer.” Identify them first.

In short, if you have no specific use for Xcode, removing Xcode.app while leaving other developer-related files alone initially is a cautious approach.

The result. 

/Library/Developer/CommandLineTools

shows that your Mac is currently using the standalone Command Line Tools rather than Xcode's developer directory.

Removing Xcode.app would not change that selection.

If you do not use Xcode's development features, there is no indication from this result that removing Xcode.app would affect the Command Line Tools.

However, this command only identifies the currently selected developer directory.

It does not determine whether Xcode is installed, or whether another application or workflow specifically requires the full Xcode application.

You're OK deleting it. If you find you need it at a later date you can always download it again.

The question ("Is Xcode useless for the common man?") implies that if you cannot use Xcode personally, it has no benefits. Most people will never use Xcode, and do not need the full Xcode development environment installed on their Macs, but if it did not exist, many of the applications that they do use might not exist, either.

Xcode is not installed by default. You must explicitly download and install it. If you go poking around on a system where it is not installed, and find files that are part of Unix, or runtime files that applications built using Xcode may need, that doesn't mean that you have the full Xcode environment installed or that you should start deleting files.

Is there an application called "Xcode" in your Applications folder?

I am curious as to how you have Xcode on your Mac? Did you install it?