One passage that struck me:
No more worries about how to install a library and dependencies. After a while, you even start installing things just for the fun of it!
I used to try to install libraries by hand only to find they had a number of dependencies, and those dependencies had dependencies, and they were sometimes unavailable, hard to find, time-consuming to install, etc. But now, when wearing my Quicklisp Library Hunter hat, I'm delighted to find things that have dependencies that aren't in Quicklisp already. That means I have an opportunity to grow Quicklisp with a set of new, hopefully-useful libraries. The more dependencies, the better! It's taken a source of pain and turned it into a source of excitement, and that's helped avoid burnout working on Quicklisp.