My brother used to constantly try to tell me this. I don't know how many times I had to compare number of keystrokes to number of clicks before he finally admitted GUI programs are easier even if you already know exactly what you're doing.
For something that needs very complex configuration like specific ffmpeg transcoding rules and cmake build files - you'd have menus that are 5-10 pages long and full of super detailed selections and forms, while in reality you'd only want to switch on or off one thing, so it would be easier just to write the command
When I made my small game engine I had a second window full of settings that I could change dymamicaly. After like 2 months of work it was so full of settings it was very hard to navigate even with all subdivisions and layouts properly made
Also, GUI apps often lack specific or new settings for the terminal app they're built on