It didn't feel like years after some time on the trip. More like I've switched whole reality, myself and everybody else. After some 2 months, life and reality back home was just a distant dream, too unreal to even consider seriously. Thank god it was before phones and wifi became so commonplace, it massively helped with that, writing an email once a week in some obscure internet cafe.
Coming back, it felt I've spent a lifetime away. Twice. Now I judge vacations on how it feels how long it lasted, the more it does the happier I am with deciding for it.