Its so helpful to draw that box and it doesn't matter how experienced you are at drawing I would always recommend to do whatever helps you - why struggle to draw something when you can just do a quick sketch and make it ten times easier. I found myself using it in a recent drawing because it was the quickest and easiest way to figure the pose out

You can also see im doing some mutation of the coil technique on Gladios outside leg. The whole reason was that without these guides I couldnt quite place where his foot would land.
Guides and refs are super helpful - a lot of newer programs now also come with perspective grids so take advantage of them!