I'm with Pooh on this one....
The best place to stay on property. You can walk to Epcot quicker than the boat can get there. MGM has a boat to it as well and walking back at night is especially nice. AK, MK, DTD, TL, and BB all have excellent bus transport. And the Boardwalk is in the center of everything. There are four or five good restaurants right on the Boardwalk along with a few shops. The entertainment is just fabulous. And if this is not enough you can walk to the Y/B club or Swan & Dolphin for other dining options.
Now for the room part....
If you are lucky to get a Boardwalk view I assure you it will make your trip ten times more wonderful than you ever imagined. I had one recently and I sat out there everynight and just watched the people, listened to the music and sounds, I loved it. The Boardwalk Inn has lovely rooms. They are decorated so nice! Fairly large also. If you are in the Boardwalk Villas they are spectacular...kitchens, jacuzzis, what more can you say.
That Boardwalk view is phenomenal. The ambience of this resort far outweighs any of the others I assure you.