Yes, hands down, the TTA is the ultimate relaxing spot in the Magic Kingdom for me. I'd stay on a couple times in a row to get out of the sun.
In Epcot, I love the Impressions de France movie. It's relaxing, and I haven't fallen asleep in there, even though I might want to if I'm feeling wiped out.
At the Studios, I really haven't found a place to relax and unwind.
At Animal Kingdom, I like area off to the left side when walking from Africa to Asia. There's a little path that winds that direction, and it's shaded.
And at the resorts...
If you are staying concierge level, those lounges are fantastic. The Polynesian lounge has a wonderful Magic Kingdom view. At Animal Kingdom Lodge's lounge, my friends and I spent an entire afternoon playing Haunted Mansion Clue while enjoying the lounge goodies.
I do like the back porch area at BWV, and the Solarium at BCV. The lobbies of GF and AKL have wonderful chairs and sofas. At Wilderness Lodge, walk up to the second level or so. There are chairs set up overlooking the lobby. It's cool to view the lobby from that higher perspective.
And the place I always liked to relax the most is no longer open...the Adventurers Club main salon. I would sit either on the circular "poof" in the middle or one of the side chairs. That was my favorite location at WDW to relax.
