I've been playing since '86 and I've never played with a Druid in the party. Weird, because while they aren't the most popular class they aren't bottom of the barrel either and they've been a class for ever. I also voted for Warlord, but I skipped 4th ed, so there's no mystery how that happened.
I have a similar experience re Druids, in that I am literally the only person I know IRL who has ever played a Druid. Loads of people consider it, loads of people say nice things about them, but they rarely play them. I've seen more 2E Mystics or 4E Invokers than Druids! Hell I've seen multiple 2E Speciality Priests of Torm, whereas only the three Druids I played. And in 5E they're genuinely a good class!
My votes were Barbarian, Monk, Druid and Ranger.
Druids - As noted.
Barbarians - Problematic in 1E, a terrible underpowered weird Nat Geo class in 2E (and problematic in a whole other sense!), low-tier in 3.XE, but we did see one, okay in 4E, and have yet to see one in 5E despite them being solid.
Monk - Despite entire OA campaigns and stuff and my main group being martial arts fans, we literally have our first ever Monk right now! Well, someone had some levels in it in 3E but only in a misguided attempt to cheese their AC (which got retcon'd so they were back to pure class wizard).
Ranger - in 2E we occasionally saw multi-class Rangers. Since then? Only people new to D&D seem to play them. And they often ask to change or create another character. Though I will always remember my little sister's 2E Ranger and her proud boasts about her Ranger's leopard companion!
Everything else we have seen a fair bit.
I think including Warlord is weird and unfair, by the way. It's not a 5E class and all the others are. If we include it we should include all the other "one edition" classes, many of which were far more rare. In 4E Warlords were pretty common. So that's a really misleading figure. And I say that not particularly liking Warlords.
Warlocks of course remain the stand out class for suddenly arriving and immediately being popular. We've had one in most groups since 4E. And Fighter is I think the only class I've seen, at least as a multiclass, in every group with at least five players in it.