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?