Truly. That operator has most of the gravity that pulls me towards coffeescript.
Lodash things, like _.isNil staunch the bleeding, but it's just.. not the same.
I wrote coffeescript for 3 years, and the first 2 or 3 months was a frustrating learning curve. By the end of that job I really drank the koolaid. Coffeescript can be blissful. The complaints about invisible delimiters and stuff resonated with me for the first 2 weeks, but then I just learned it like you learn anything. If you are unsure what's going to happen, add extra parenthesis. I kept a window with js2.coffee on it so I could paste uncanny snippets while I was getting up to speed. After I got over the curve I stopped needing it.
I think it was more frustrating in the beginning than learning most things because I knew JS pretty well prior and it felt like I was throwing my experience out the window. I'm glad I did it though. Writing coffeescript was really quite pleasant. Now regular javascript has jumped forward a bit and has somethings coffeescript doesn't, I still feel like the one true web language exists somewhere between them.
I'm leading a project right now and every couple of days I get that coffeescript itch. Caffeine is hard to put down once you're addicted.
foo?.bar?().baz?.boo