The rooms at the HIFS are much smaller than they look in the pictures, but are still an excellent choice for large families who want a regular resort hotel. Yes, once you open the pull out sofa, it is hard to get in and out of the door of the room, but we just didn't pull it out until bedtime and then closed it up first thing in the am.
My kids love the kid suite with the nintendo (rent games from the desk in the arcade.)
The full hot breakfast buffet is included and the zero depth entry pool is wonderful for little and big kids. The quiet pool has a hot tub where parents (usually one, cause the other was in the room w/ the sleeping kids) congregated at the end of the day and compared touring notes. We also used their bus transportation one day and that worked pretty well.
We stayed when they were brand new, and again about a year later. My only concern would be that even after one year, the suite we had was a little run-down. I don't think they were constructed with the highest quality fixtures and furniture and the suite we had was already showing wear. If I went again, I would check out the room and if anything was broken, I'd ask to move.
For the record, we stay on-site for the convenience and ususally just stay at HIFS if we are going to SeaWorld and not WDW.
I have stayed in a Wilderness home (the old ones) and it was OK too and you can fit a family of 6 there. The new Wilderness Cabins look much nicer. We avoided most of the transportation problems by driving to all of the parks on that trip. I know my kids would LOVE to be there if we rented a golf cart for the week to get around.