Just this last week I finished Kaguya-sama: Love is War from winter season; it's a hilariously overdramatic romcom about two high-class students trying to trick the other into confessing their love. The show really pulls all the stops in presentation, making even the simplest of dilemmas look like something out of a suspense/thriller movie, and it does so with precision. There's also a lot of heart to the story, though, so one quickly gets endeared to the main characters and the supporting cast. I do hope we get a second season in the future.
Gegege no Kitaro is still going strong; the past several weeks have seen some really intense events as the overarching plot came to a climax and close. Now the show has entered a new chapter, so time will tell how long it goes. I've never kept up with a long-running, currently airing show before (in fact, I've only ever watched a 100+-episode anime twice before, and I'm still finishing the second!), but Kitaro has been well worth it.
Oh, and then there was Mob Psycho 100 II - THAT was awesome. If you want to blow your animation-loving mind, check out eps 4 & 5 at the very least. MP100 is truly a shining example of the medium's capabilities.