@neauoire
I decided to use just ed for two days as a challenge once.

In the beginning it's immensely frustrating. But it didn't take very long until the workflow clicked. After that it didn't feel particularly weird or alien, just a little cumbersome. It's livable.

Also, if you've ever used gdb, it has a similar line oriented interface to browsing the source. Once you get used to ed, gdb also feels a lot more natural to use.