As cool as E was, it was almost entirely based on core ideas lifted from Joule and KeyKOS. I can't really see any influence beyond a "wouldn't it be great if language X had feature Y like you find in E".
I was also thinking of the community, as they moved out into other languages and carried some ideas with them that they maybe got exposed to in the E community.
Are there active languages influenced by E? I came across that erights site years ago, and I always meant to learn more about it.
the concept of promises as used in JavaScript comes from E
Aren't they originally from Scheme? I remember seeing a Scheme implementation years ago.
Promises for async results has been around for decades and E got the idea from Joule.