Dunno if I miss them exactly, but they did give a different feel. Tell me a tale about heroic thieves and magic-users and it evokes different things in my imagination than a tale about heroic rogues and wizards does. I can understand why "thief" was changed, (and I often disliked the term myself when it was in use), but I wish they'd gone with something else. Sneak, prowler, or scoundrel all would've worked better for me than rogue, although I'm sure all of those would have their detractors.
As for the level titles, I like the idea, but the original implementation would not work today. The list for magic-users, for example, included many titles which are now the names of specialist wizards. The bard list consisted of mostly Celtic sounding words, with one very Latin name sticking out like a sore thumb. Some of the lists (barbarian was one I think) consisted of the class name itself at every level.