I definitely needed to rewatch things like Log Horizon, Full Metal Panic, Chihayafuru, and Euphonium when the new seasons came out. I jumped into some others like Tomozaki-kun and Masamune's Revenge and those weren't as bad but definitely took an episode or two to remember what was going on again. As a dub fan, Haikyu is still one I need to get back into. The gap between s3 and s4 getting dubbed was killer and I ended up forgetting most of 1-3 by the time the blu-ray came out. I want to see the new movie in a few weeks but there is no way I am going to catch up by then.