I don’t have a specific example. I’m the design draftsman at a company that specializes in finishing basements. I’m responsible for drawing everything from full floor plans to crown molding details.
My primary use for a guide plane would be at the stage where I switch from 2D floor plans to starting to build a 3D model to show the client proposals. I run into a slow-down where I have to add the wall back in above doors and windows, as those areas of wall are left out in 2D drawings. If I had an easy way to just pull up a guide plane at 6’-8", it would save me a good chunk of time on every job.
I realize sketchup offers a few different ways to achieve my final result, but given my personal workflow, a guide plane that functions similar (or identical to) the push-pull tool would be immensely useful. I envision it as an extension of the tape measure. If I activate the tape measure and put my cursor on a face, I should be able to pull up a guide plane parallel to that face.
I could also use it frequently during cabinet design work.
I have found that using layers only complicates things and makes setting up views more difficult. I am often making changes to drawings live, with the client in the room, and with my computer desktop being projected onto a wall. Efficiency is paramount.
I have checked out the WorkPlane extension, and it works, but seems more cumbersome than it needs to be.
I love how intuitive SketchUp is and I realize every day how lucky I am to get paid to use it.