I think it depends where they measure from and to.
Sunset Lakes is just beyond Emerald Island. If you want a measurement, from the entrance to Sunset Lakes to the Rainforest Cafe at Animal Kingdom is 4.4 driven miles. See this google map.
http://maps.google.com/maps?f=d&hl=en&geocode=12479087153448205422,28.353258,-81.592691&saddr=Sunset+Lakes+Blvd,+Kissimmee,+FL+34747&daddr=505+N+Rainforest+Rd,+Orlando,+FL+32830+(Rainforest+Cafe:+Disney's+Animal+Kingdom)&mra=pe&mrcr=0&sll=28.35239,-81.566174&sspn=0.089584,0.156555&ie=UTF8&z=14
I would guess that it is under 3 miles from the edge of Sunset Lakes subdivision to the edge of WDW property. It is still in a pretty close location and if the property is right for you, then go for it.
-Kay