Just like people read a book in a series, they then have to immediately read the whole series. Now that we can watch a show like a book, by watching episode after episode and season after season, binge watching has increased.
This season I've been catching up on shows and re watching some favorites as I "work" from home. That included a Sherlock marathon day. Starting and finishing Mr. Selfridge. And re-enjoying Community. Unfortunately I watch a lot of TV throughout the year so I'm on a continuous binge. I think it's around 40 current and continuing shows each year that I watch.