I've been studying game development for years, and not once have I really needed a second monitor. Heck, I can run Godot on a laptop if my graphics don't have to be superior. I would like a second monitor for certain things, but otherwise it's not a bad setup if you need to export to the desktop and import from the desktop straight to your Godot project.
If you're working with 3D, and you ever do need superior graphics, top-notch characters, and excellent rigging, you could try to save up for grabbing Daz Studio as well. It's free, but it can get expensive when you use it for real projects. However, if you can afford it, the results are stellar- and they have buildings/props/locations you can use as well.
These are characters from the 3D game called Psychotic, which I've been itching to get done some day. In the last character in the list, a closer shot of my icon, I did some editing in Unity- added the brain and light bulb-hat, and the lights, and whatever, but it still gets my point across. You can tell from this that he is actually a light source with glowing, alien skin.
The main character:
Extra:
Some villains