Well, the food alone is worth it...
But probably what I love best is just talking to the "Citizens" of the City - the performers, craftspeople and vendors and folks who make it all work. They are all - every one of them - friendly, wonderful people, and we always leave feeling like we have visited with old friends, and made new ones!
If you like the theming and Imagineering at WDW, then SDC will leave you stunned, because so much of it feels so authentic. I have been visiting since the early 1970s, and it never fails to delight; I have so many treasured memories from SDC that have nothing to do with rides, but are centered around the people (and yes, the food!) and experience of just visiting the City. While the pandemic has certainly affected operations - as it has at theme parks all over the world - just walking around and enjoying the scenery alone is a treat.
I hope you will come back and tell us what you thought of it! Have fun!