Helps me Google less boilerplate code since I don't code very often. Otherwise it's a nice productivity boost that blends into your workflow without you really noticing. Might have to play with settings a bit to get the UI right.
The search is pretty key vs other competitors I've used. Comment threads, and interlinking between docs is great. Embedding images/filetypes + having long documents not consume a ton of resources on my machine needs a bit of work though.