My group sees it as a crutch more than an aid to role playing, and we are happy to play without it.
Alingment are not just concepts on D&D universe. Order VS Chaos and Good VS Evil are FORCES in constant conflict. A campaign in mid of a war among devils and demons is far more a chaos vs order than good vs evil,. A LG paladin struggling to chose between "law" or "good" when he is on a L.E. town...
Back on 2e, clerics and paladins could even lose his powers if they step away from their deity's alignment.
That is correct. How does 5e handle fallen paladins?
Fallen Paladins (oathbreaker) is a subclass for paladins who break their oaths.