I've been using emacs for ~15 years. I don't now what is considered lean. My init is 343 lines. Probably removing all the comments and junk collected over the years it is likely ~200 that actually does anything useful at this point, I should probably clean up. I use emacs everyday. I get the desire to want to do everything in emacs but I also don't. It is good at what it does, it happens to do other things too but I don't know if that is the best way to work.

I've been using emacs for around 30 years and your comment made me curious. My .emacs is 237 lines. It used to be more, but I cleaned out the Java and Octave support I wasn't using anymore.