Re: As a long-time Vim user (since 2005 or so)
I much prefered EDT and TPU, personally.
You are probably thinking of EVE. TPU wasn't an editor, rather it was a text programming language intended for writing editors, but it came with EVE, the Extensible VAX Editor. This was written in TPU and intended to be an extensible emulation of EDT although it never quite succeeded in getting the basic emulation right.