May I introduce you to a new(ish) track planning program from Europe that is quite good, and quite intuitive. I think that you will like it. It even has 7 (count 'em, seven) track libraries of Gauge 1 and “G” gauge track manufacturers. 3 from Aristo, 1 from LGB, 1 from Marklin, 1 from Peko and 1 from Piko. In addition, it has all the usual bells and whistles like buildings, trees, and water.
I think that you will like it. It is called, SCARM for Simple Computer Aided Railway Modeller