Althought I am still at low Lisp level, but every one has his learning road.
I learn acad and lisp at 1996. What attract me to Lisp is a function for drawing "sin" curve in a book.
Then for a long time, most of the Lisp I wrote is just a batch command that just combining several command and in one. and they give happy. Then download some lisp from
http://www.cadshack.com/lispfile.htm.
(now the website has changed)
Because we only use autocad 14, so I reject to learn vlisp, until 2004, in order to skin a grid structure, which need xdata. From then on, I read some book and start to study the visual lisp, I find a new world and find I get far behind the Lisp, so I start to learn vlisp from help, book and internet. Now I learned a lot from google group and theswamp.
Lisp is wonderful thing, now I always treat Lisp as LEGO toys, it give us some useful tools and materials, and we build a high rise. Althought I am not major in programming, but in the leisure time, some strange idea about accelerating or improving the drawing speed often jump out. Lisp give me the capacity of controling the geometry entity.Maybe I has been cought by Lisp.