I laughed more at the trailer / promo than I have at most comedies on TV these days. Also, if you haven't checked it out, they recut Season 4 to move chronologically, instead of one cast member at a time. This created a full 22 episode season with typical 1/2 hour comedy length. (I like this better and have just started the rewatch.)
I'm about half way through the new cut of season 4 now. It's amazing. I thought the original cut was ok. I had to watch it twice to try to figure out the time line. I never watched it again because It just wasn't as fun. I quit watching TV sitcoms after Parks and Rec went off the air. This has me really excited to start watching them again.