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This is really just my opinion but I always can’t tell when an app uses QT and not positively. QT just looks uglier and feels more windows XP-esque than GTK apps

Gtk is more than Gnome. It is also used by Xfce and other DEs. So while Qt is also popular, I think it's fair to call it the most popular.

I just use the default terminal, konsole, in kubuntu. Is Ghostty that much better?

No, Konsole is awesome.

How about wxWidgets or Tcl/Tk or Fyne?

This is where your fork can come in