Your mileage may vary, but I've retired early, can do whatever I like, and I do not get bored anymore.
I am very glad I joined Zwift. I ride bicycles for the joy of it and I feel the same way when I peddle in Zwift as I do riding the same old MUT's everyday. Just like on the trails, I come across people that ride in a similar fashion as I do and we just ride along together. I've seen heart rates I haven't seen in 25 years and the only voice in my head was saying "don't quit", not "this is boring".
I've got 4 winter months to get through and it will cost me $60 instead of $40.
I can remember when there were no computers and this is pretty darn cool.