Part of this is due to many institutions, companies, governments, etc, just closing 'for the next month or so'. Then after a few weeks, they extend it another month, and so on.

It seems like many expect the pandemic to just magically disappear when you do a very low-effort quarantine and sit back and relax for a bit.

Remember, this entire pandemic started from one person being infected. As long as there exists one person with this virus, it can start back up and easily scale to millions of cases all over again. Victory is not easy, and some of the main reasons we are doing quarantine are to learn a lot more about treatments, cures, how to cope with these changes to our supply chain, and many other things; that is, to buy us time. The levels of quarantine most countries are doing obviously slow the spread down, but are not sufficient enough to completely stop it. This is a long-term event and will be with us for a long time.