I use it a lot, even though it's supposed to be bad for me (astigmatism).

I am very used to it though, as I started out when computers just showed green (or amber) text on a black background. And those displays could also be tuned much better than current ones. I have an old serial terminal that I can set so low I can barely make out the text in a pitch-black room, and it can go so bright that it is readable in a sunlit room. A lot of flexibility was lost with the move to LCD (and even more with Amoled, which suffers from black smearing at low brightness, and usually really bad PWM).