If you are in the US, yes.
For me, it works like this:
I want to watch a movie. I look in Netflix, which has less than a few dozen movies. Can’t find it. So I turn on the VPN, for which I pay also money. Ah, there it is. Now, let’s Chromecast it... Oh, fuck, forgot Chromecast doesn’t have the VPN. Let’s set up the VPN on the router...
(by now the person with which I wanted to watch the movie turned on Popcorn Time and has already started the movie, while I try to read the documentation of my router).
In the US, Popcorn Time is not really useful.
But especially in english-speaking european countries with bad coverage from US services, like the Netherlands, Denmark, Belgium, Scandinavia, parts of Germany, etc, Popcorn Time is often the simplest way to watch a movie.
Before Popcorn Time, German online streaming portals like Movie4k.to, Kinox.to, which are built around hosters like streamcloud.eu or megaupload.com (RIP), were so popular that 80% of the German population has used them at least once.