I leveled a rogue earlier via a more “casual” route, so without the XP pots, hardly any dungeons and so mostly via questing without knowing most quests, and needed 3 days and 20 hours (so 94 hours) /played to get to level 120.
Yes it is.
But then again, on retail the end-game is where most content is at, in Classic leveling is 90+% of the game. So you are comparing 2 different aproaches to content.