It helped re-instill my faith in creative computing and reminded me that on the other side of the text there are people on keyboards doing the thing. I spent most of my time there messing with emacs (shoutout Eric+Zach @ emacs-nyc!), collaborating, and giving small talks on things like mpd and colemak -- you really are encouraged to share whatever you want (I remember someone's tutorial about home cultivated yogurt that was really cool).
My time there helped set the "hacker spirit" tone of my sabbatical (which I took with a goal of pivoting to being a hired clojure programmer), and drove me to write and share much more, one post of which even ended up here![1]
There is a lot of communication that comes for "free" with the physical space -- I was much more active in the zulip chat after my RC batch than I ever was during my time there. They have done a good job mimicking the physical experience in a virtual setting now though, and have iterated nicely on what makes a virtual experience different than the physical.
If you're curious about attending and can take the time, would recommend! (there's no cost): https://www.recurse.com/apply