As if Foucault has had any major influence. He's literally one among thousands of philosophers and by far not the most popular one. I'm working in a philosophy institute and of all 60+ researchers there is but one postdoc who takes Foucault as a basis of his own theorizing.

Foucault has had a huge amount of influence, though mostly not in philosophy.

In my experience he's inescapable in the humanities.

Wikipedia: https://en.wikipedia.org/wiki/Michel_Foucault#Influence_and_...

I work in the humanities and disagree. I know plenty of people in neighboring disciplines, too, and can assure you that you won't need to read Foucault in any of them if you don't want to.