> I have seen the same argument about syntax highlighting. That pretty colors makes for sloppy code reading and monochrome text means you read slower and thus more thoroughly…

The amount of times color change has indicated syntax error to me makes it a no brainer. Sure, some systems may have an older editor that doesn't have color highlighting, but that's a rare scenario for me. I'm not going to give up the huge benifit just to "train" my mind for such rare cases.