Biggest user is Aerospace, simply because the darn things are rugged, reasonably reliable, are available in rad hard versions, and also are the part that is certified for this application. gotten them and abused them, and they are rugged, even when using them with 44 volt power rails, so they would be able to output 30V peak to peak, replacing some dead OP20 amplifiers, though i did add the TO100 heatsinks to them to keep them cool, unlike the OP20's, which had cooked nicely.
Yes for general purpose use at lower voltages there are better parts, but for industrial logic with not much required frequency wise, and with a truly big common mode range hard to beat, plus they will survive transients that would kill other opamps, simply because the die is so large.