For me, it was a couple things:

1. it made hills way easier
2. it tripled the range I would normally have the time or willingness to go for any given trip

I simply do more with it than I used to when I just had a regular bike.

Regular bikes are definitely not obsolete or anything. In an area where it’s quite flat and there’s a lot of density and transit options, I think a regular bike is a better option. And ebikes are very heavy, so they’re not really an option if you’re in an apartment and have to carry it up and down stairs every day.