It's much more than a gui for it supports running k8s locally, managing custom vm instances, resource monitoring of containers, built in local domain name support with ssl mycontainer.orb, a debug shell that gives you ability to install packages that are not available in the image by default, much better and automated volume mounting and view every container in finder, ability to query logs, an amazing ui, plus it is much, much faster and more resource efficient.
I am normally with you that terminal is usually enough, but the above features really do make it worth it especially when using existing services that have complicated failure logs or are resource intensive like redis, postgres, livekit, etc or you have a lot of ports running and want to call your service without having to worry about remembering port numbers or complicated docker network configuration.