No, not really. It will take you about 10 -15 minutes. I'm not sure where Marriott Horizons is so not sure how out of the way, or what you consoder out of the way. I find the roads fairly well marked as long as you have an understanding of general layout and where things are at. For instance, WCC is in the Wilderness Lodge. It will help to know that this is one of he Magic Kingdom Resorts and of course, located near the Magic Kingdom. Once leaving AK, then you'll follow signs towards MK, As you get nearer MK, you'll follow signs to the MK resorts and then WL. A good map is always a big help too!
Good luck and have fiun!