Creating a map for a game can really set the scene for some people and help them to play better... but its really really annoying on most programs and takes alot of spare time to do correctly.
This tool on the other hand is really well created and makes it really easy to develop some really nice looking maps that can be exported with ease.
For the last 20 years, I’ve been playing tabletop RPGs with friends on a very regular basis. I’ve spent a huge amount of time writing scenarii and missions. I did it with traditional pen & papers at first, and with Google Docs afterwards. Problem is: it’s ok to write missions with Google Docs, until it comes to drawing the map of, say, a dungeon in Warhammer, or a haunted house in Cthulhu.