I created a custom "track" on TrainerDay and spend about 20 minutes 2-3 times a week doing this.
It feels like dying - but I like being able to extract the most value out of the lowest time investment
Since you can dial in the assist, it basically turns a regular bike into an exercise bike. Or conversely, an exercise bike that actually rides around outside. If I want to fry my legs on a hill, I can drop the assist and really feel the grind. If I want to take it easy on the hill back home though, I can boost the assist so that it takes practically no effort.
It's just this amazing tool that reliably will trick your brain into working out. You take the ebike out because it is so effortless to ride, but inevitably you end up lowering the assist to feel the burn a bit on your rides.
Biking to work using Strava is like this for me.
It gamifies exercise in a very addictive manner. Getting a PR, being quickest on a segment or becoming a local legend. There is always someone or something to beat.
Besides, I got records and fastest times when e.g. wind was at my back or the lights all went my way - so I knew it wasn't just my effort & just happenstance.
I still use Strava - mostly as a personal blog of my efforts & take a picture of wildlife or crazy videos to share with others sometimes.