I expected a filler, thankfully this wasn't one. It's funny reading the comments here, how can someone call this a filler? Darryl and Carol make huge steps towards the whisperers, Negan takes even bigger steps... The plot is moving along while opening new doors.
The camera work has been mentioned here and I have to say it's awesome. It's so good I never once noticed it. That's what camera work should be like. I don't want arty shots, or shaky cam... I don't want to feel like I'm watching a show, I want to feel like I'm in it. And this proper camera work does just that.