It really depends on what the monitor is showing. High refresh rates on a CRT are really best for "gaming". When you are getting high FPS (frames per second) most flat panel monitors will have a slight ghosting effect. I've noticed that when playing first person shooters on a 19 inch flat panel monitor.

With flight simulators though, its not as noticeable. Also, one thing to remember is that with a CRT your lines will be cleaner - anti-aliasing has a better effect on CRTs than it does on flat panels.