Bill, remember also that building a nice map is all in perception. As in what your players see versus what you see. I build maps and dungeons all the time and from the player perspective everything is nice and for the most part seamless. From my GM view I see all of the rough patches and lines and left over tokens I may or may not use in the course of the adventure. So build things with the mind set of what your players will see. Don't try to build everything exact: I use several "generic" maps. Things for standard plains, hills, forest, swamp, etc. Think ahead towards what terrain your party will be traveling in, and build something generic. Save the detail work for the dungeons and adventures. Some marketplace creators, well lots of them, build sets that you can build things with quickly. I've built decent-sized dungeons with some of Munky's sets for example, quickly and efficiently. The more maps you build: the better you'll get the hang of it. And, the larger your collection of artwork (free or paid) the faster you can build whatever scenario you are looking for.
