For me: it doesn't really "bring" anything more than what I expect from a terminal.

In Mac, we had the default terminal app which has some problems with TUI apps and other small issues. iTerm2 is the replacement that most users use, but it become too bloated with useless features and AI, while it was hard to keep a good config file that I could share between devices. Ghostty was a sane mid-term for me: a good and modern terminal, with a simple config file, maintained by someone that I trust (Mitchell Hashimoto) and only that.

About Linux: I don't use Ghostty in Linux because I'm comfortable with Konsole.