Honestly, for me I think I just need to move my body through space and talk to people to be happy. I'm probably more gregarious than your average developer, but definitely still an introvert and talking to people all day would be exhausting. Still, I need some social interaction. I feel like WFH was in some sense easier (could sleep in later, for example) but I just felt like I was withering away. I was craving some sort of variety, some stimulation, seeing different things and people. Being surprised by things! I missed all of that. Video calls are a poor facsimile of human interaction and the whole pandemic period felt dehumanizing.