Gee I feel all simple minded, I have mostly done the Rent-a-Tech shuffle, and only rarely worked where there was anyone with the slightest lisp capability. I have also worked in several disciplines, as, in the old days, all they cared about was your ability to make Autocad work and they would teach about the discipline.
The resulting compilation is that most focus on geometry issues rather than say doors (though I did do a whole raft of doors) and each is self sufficient, no crossrefing functions, and are designed to work in any type work environment , from "we don't do blocks or polylines" to some very sophisticated and regimented offices. They are also by necessity small, as most were written on the fly, and I personally prefer a "one job one lisp" idiots are on their own approach.
Occasionally I am the cad manager, sometimes the cad guru, sometimes the Leper :ugly:
When I have been the cad manager I have set the other folks options to point at a directory on the server where I managed the lisp directory so everyone loaded the same (simplified) Acad.lsp and any special rarely used functions they would drag and drop. Before that was possible, I had a lisp routine that was similar to appload in the acad lisp. (I still do, and in general use it, rather than appload out of habit)
Doing Autocad on the old 8088, every move had to have an eye to the time issues for the computer, when even a redraw was a coffee break, and a regen was lunch. But now even an old 500mhz with a "paltry"
526 meg of ram is only rarely inconvenienced enough to notice. And with a decent, hot, dualchipper, even a huge drawing works faster than fingers can go across the keyboard. So using up computer memory is not the concern it used to be.