Nope.
I am a scripter. I will never get tired of raw text, but I sure get tired of GUIs, fast. If the author had pitched this as a way to make the scripter's scripts accessible to others who do not understand scripts, I would have a different response.
On Linux you can use `notify-send "title" "content"`. The only limitation it has is that you can't query the notification id to update or selectively dismiss it later.
Also, many terminals will have a visual alert instead/together with a sound: konsole does this, for instance.
When your script was a bash script chances are you targeted proficient users with it. These might get annoyed by popping up stuff. This means ultimately you are probably better off adding a GUI and a --headless flag so both user categories are happy.
As I see it the only thing that is a little useful are the notifications (e.g. if you have some sort of daemon running in background that needs to bring sth to the users attention)