The only really useful highlighting I've found, really essential, is distinguishing comments from code. In on of my luddite moments I switched off all highlight

The only really useful highlighting I've found, really essential, is distinguishing comments from code. In on of my luddite moments I switched off all highlighting (because I am hardcore) and spent an hour debugging a block of commented-out code. Just didn't get why my changes weren't working. Stupid compiler.