I'm of the opposite view from most, it seems. For feel, rather than mechanical reasons, I think the multiclass restriction should apply to Druids as well.
From a game mechanical perspective it just seems insane to allow people to multiclass into Paladin and Monk; if it were allowed, every arcane caster would take one level of monk and every fighter or ranger would take a single level of Paladin.
From a game mechanical perspective it just seems insane to allow people to multiclass into Paladin and Monk; if it were allowed, every arcane caster would take one level of monk and every fighter or ranger would take a single level of Paladin.