I'm fairly new still but I find the yards are relatively simple just boring and a tiny bit time consuming. Using OSM does work well to speed this up, but honestly I can do a yard in about a few hours. Where I find just getting a mile of track the way I want it with elevations is much more time consuming. Perhaps I'm missing out on a detail. i just use the insert diamonds trick and eye in the connecting tracks. Mind you this is for a typical later. Not curved yards or other complex variations that would indeed take more time. For my area I'm fortunate.
Thanks
Sean
Thanks
Sean