Another time I prefer the eBike ride is when I've gone for a (mBike) ride the day before and my legs are sore. I take the eBike the next day and rest my legs a bit, but still get exercise that next day. Then, the following day, my legs are are good enough shape to do another mBike ride!
I'm thinking about a Friday evening ride tonight on the mBike. Then, ride an eBike with the Coffee Riders tomorrow. Then another semi-serious mBike ride Sunday morning.