Also, CGA's 320x200 4-colour mode is only like that on RGBI, EGA, and VGA monitors. On composite, the 320x200 4-colour mode functioned more like a 160x200 16-colour mode due to NTSC artefacting and composite not separating the colour signal from the brightness signal.
The coolest thing about CRTs I reckon is being able to put them in vector mode. I remember reading an article about a pop-up retro arcade with classics like Asteroid running in true vector mode on actual CRTs and all the kids mentioning how it feels like a very different experience looking at the lines being actually drawn as lines in real time.