Well, I'm not a teacher (I lead a USDR team), but they really do. When restrictions started, my wife and I set up twice-daily Zooms for our son's class while the schools figured out what to do. It was exhausting, but eventually our kid's teacher started joining them and now has taken them over. She also conducts a dozen "small group" sessions throughout the week, and juggles the wildness and lack of attention of kindergarteners with the responsibility of raising her own newborn.
It's cray for everyone, just in different shapes and sizes.