Jeebus, just thinking about that gives me anxiety. Gutters and water runoff are kind of important out here. I filled a 250 gallon IBC tank with runoff from half of my shop roof in about 30 minutes yesterday. I try not think about what it would do to the building and the ground if we just let it run off the eaves...My mom simply elected to not have gutters installed on her house when she recently had her roof done. Maybe just put a short gutter with spout above the door? I mean... it's just water. Unless, of course, you have water problems in the basement - then perhaps not such a great idea.
This summer I plan to put 30,000 gallons worth of rain water holding tanks in place. That should help with irrigation and potential wildfire protection.