I mostly write 'indexes' these days when I'm not on autopilot, in part since not all of my coworkers have a high English proficiency and just following the normal +(e)s plural makes it easier. My brain really does not want me to write 'matrixes' however (and indeed, my dictionary in this browser is fine with 'indexes' but not 'matrixes'). I also try not to be pedantic with verbs whose irregular forms have become less common than their "incorrect" (at least when I was taught) forms. "Shined" being one of these, but I am sure there are more.