That's correct.

windows/linux: ctrl+shift+S

mac: cmd+shift+S

Opens the ssh connection manager. And yes, it just uses the standard ssh, psql, mysql (etc) clients. The benefit is just clicking a button to connect. This could also be done with many different strategies. bash_aliases, ssh_config. But for a nice gui and button push UX this is what is provided. Also, if connecting through yaw there is a handy Remote Sessions gui (ctrl+shift+R) to interface with tmux or screen sessions easily.