I'd have to disagree with learning the "real way". Easier said than done when you're towing a shorter trailer that you can't see.
I've found the back up assist critical with our small sea-doo trailer. Our local boat launch is very narrow and requires a bit of precision. It is easy with my 18" boat, or in an SUV where you lift the tailgate with full view of the trailer.
In my raptor, you can't see the small trailer at all until it starts turning into view of the side mirrors...and by then with the narrow launch, it's too late and you have to reset.
The trailer assist works extremely well in this specific case. Line up the trailer with the launch, and the truck makes these micro-adjustments to track perfectly down the ramp.
Yes, I it's good to know how to manually to it....but it's also good to explore the capabilities of your truck and use all the tools in the toolbox when you need it.