No disagreement here. The country needs more PvdA politicians like him.
As for the differences: Drees was a typical post-WWII style social democrat and arguably one of the most popular Prime Ministers ever. Den Uyl was somewhat of an "old leftist" too, but he had to deal with a party being taken over by the New Left movement. He led the most left-wing government in Dutch history -- he also led the PvdA so far to the left that it became huge, but uncoalitionable from 1977 until 1989 except for a brief period in 1981-1982. Wim Kok was your average Third Wayer who said the PvdA "had lost its ideological feathers" and thought that was a good thing. His purple governments, which introduced some of the most progressive legislation in the world (SSM, euthanasia), were pretty popular but cannot be judged without taking into account the Fortuyn revolution in 2002, just like Obama's presidency cannot be judged anymore without taking into account the Trump win.