I must admit it was strange to get used to it. If you need to create professional looking documents, it's necessary to adjust line height, be able to work with tables etc. That being said, once you need to look up your favorite functions with Google.

Also LibreOffice (former OpenOffice) had PDF export a decade before Word. This seems to be a ridiculously essential feature. Last but not least, it's way more comprehensive than Google Docs.