Yep! They are very close. The HRH is closest to USF, and it's probably a 5 minute walk. The RPR is closest to IOA, and is maybe a 7-minute walk. The PBH is farthest, but it is only about a 12 minute-walk (maybe) to USF.
Just a short walk from any hotel, it really makes the whole experience. No crowded buses, ticket gates, etc, just out the door and along the path to the parks. You'll love it.