Meh to that, I use an analyzer whilst mixing (ear too, obviously) in a "measure twice, cut one" kind of double-check. Plus sheesh try and ballpark a reference mix against one of your own without one? I'll take the analyzer over ears for that too.
Making electronic music? Good luck using your ears on that sub bass.
Are you older? Making music for younger folk? Also good luck with just the ears. That's why I've started listening to all that "hippie music" now that I'm a fuddy duddy. That techno business must be made for dogs or something! :-)