SQL vs. Mongo query

I'm new to mongo still, but isn't it pretty rare to ever need to make a query like the one in the example with mongo?

My understanding is that the (one of the) whole point(s) of using mongo is that you can organize your data in a nested way so as to minimize the joins needed and just make simple queries, then only use the data you need.

I find that SQL is the only language I use where reading a query written by someone else is easier than writing it.