"Me too" -> what are the elements that make up the old feel which you don't find in 5e?
I am not sure about very old editions, but at least the 3e specialist wizards "feel" had everything to do with:
- which spells you knew
- which spells you were forbidden to ever know
Wizards in 5e play differently in general due to the loss of vancian preparation restrictions, so maybe you mean this general difference? Or do you mean that the actual spells have changed so much that you can't for example recreate some favourite tactics of yours?
Otherwise you can certainly force a specialist wizards in 5e to simply learn more or less the same spells as usual (at least by name), and to not learn any spell of another school or two, if that's what you want. Personally I do not miss that restriction at all, but a specific PC could of course just decide to focus on other schools.
As my overall opinion on the 5e Wizard class, I also kind of miss a "generalist" archetype (the UA Loremaster would have been good, with a more balanced implementation). But as for how school specialization works, IMHO it has never been better than now: in fact, it's always been lacklustre and boring in the past, if not outright "wrong".