I need to get a design program for my computer for designing landscapes, and I figured I would get some advice from this well-educated bunch. It doesn’t matter to me if it runs on pc or mac, as long as I can use it to design yards just like I would with paper, pencil, scale rulers and t-square. Actually, I want it to design yards better than paper and pencil - I’m tired of erasing. 
LANDCADD, by Eagle Point, is good
but requires a bit of familiarity with typical computer-aided design software handling