Personally, it’s the power of powershell that I use for the hundreds of windows servers. Otherwise it’s the power of Linux bash shell scripts for the dozens of Linux servers. None of the Linux servers run a gui so there’s no options there. Tbh for me, self documenting gui is the slowest way to do work. Configuring hundreds at once with peer reviewed scripts and change control is much more effective since the peer review and change control will be needed either way.
Oh though I use fortimanager a lot of configuring dozens of Fortigates. Only have a few scripts on it though.