The up front preparation of the Hirst Arts blocks is the major danger of them as well: I have a number of the molds and get so wrapped up in casting and painting pieces of my dungeons that I forget to actually work on the writing and planning part
What I do is print out a 1" grid on paper, cut it out, tape it together, and draw maps directly on it. Low cost, pretty quick to do, and easy to transport (roll it up like a blueprint).
Here's one, about 2' x 3' in size, with my brother's minis for scale...
... And here's another shot. These are the floors in the tower from the Heart of Nightfang Spire adventure, by the way.
I spend about 10 minutes cutting/taping the sheets together, and then about 30-60 minutes drawing each floor. This is while being anal retentive about keeping accuracy with the published maps, which took me a little longer to set everything up. Your actual drawing times may vary.
Don't forget the upcoming 3D tiles. They aren't as varied as Dwarven Forge. However, they are much less expensive and still look very good (and are very easy to put together).