Honestly, when I first started using Zwift it completely transformed my enjoyment of the trainer. I went from hardly being able to do more than 40 minutes to riding for 1.5 hrs inside. I really loved the competitive aspect of catching people, holding wheels, dropping strangers, groups, going for jerseys, ect.

The shine has worn off a little for me because it's still the same thing over and over (though you can run custom training programs in the game). It's still way better than a "normal" trainer experience, but I now sometimes find myself running Zwift on my laptop next to the bike and then watching a movie or show on the TV in front of me.

Still worth it, but it's not that revolutionary excitement I had when I first used it. I'd probably rediscover that feeling if I got a "smart" trainer, because I use it with a dumb trainer that can't adjust resistance which detracts from the immersive feeling when you hit a climb and keep pedaling the same cadence in the same gear, but see your little avatar rider slow down to a crawl.