I'm a little late to this thread. I'm a longtime architect using Mac CAD but have been retired for 17 years now so I no longe need CAD other than as a hobby. I got started with the Mac in 1984 because of WYSIWYG the first time in drawing and CAD. I once tried them all and my first was PowerDraw, now PowerCadd by Engineered Software, engsw.com because not only see what you draw as printed but it was extremely easy to use and capable as drawing on a drafting table by hand. They have a demo on their website.
For my hobby efforts now and when I do want to personally convey my creations, for 3D I use SketchUp 3D. It is capable to draw in 2D as well and think the easiest 3D to use.
For just strictly 2D I have been using Microspot MacDraft Pro, microspot.com which is another WYSIWYG Cad program. It is not as sophisticated as PowerCADD, but is simpler because of that. They too have a demo to try. Not a house plan but similar is my drawing for a camper van RV in MacDraft Pro. This is a working drawing with dimensions and with the same drawing by turning layers on and off, a graphic illustration.