I use Google Sheets a lot and I love it. From the common uses like task management to using it as mvp for a web app or a database for an mvp.

What's interesting about Sheets is that the tables can be thought of as a database with columns and records, or a CSS grid and you can put buttons and everything on it.

Currently I made a task queue for myself in sheets. There are a lot of things I want to do and I find out about these interesting stuff while in the middle of something else; so I just put the mew thing on the queue and forget about it. Works great. I also tag these tags in case I want to analyze them later.

Finally, for fun, and also shameless plug, I made a Tetris using it. It even has animation when the tiles disappear. See it here: https://plumsempy.com/2018/09/17/tetris-on-google-sheets/

It is a very powerful tool.