We used the FP+ for that parade, too, and really loved it! Having the space and the view was great (and it was such an excellent parade!).
The lack of shade was a little rough, but for us more than worth the great parade experience. In addition to the tips above for dealing with that, we found that the curb was way too hot to actually sit on! So if you’d like to sit, having something like a sweatshirt to lay down might be helpful.
Another thing that surprised us was after we were all in the area, they took down the ropes around it. We were a little worried that this meant other people were going to flood into the area and we’d have to defend our space, but cast members said the moved the ropes just so we would have an unobstructed view and I think they kept others from coming into the area.
Oh, one other benefit was that we planned our afternoon break for right after the parade, so we were right at the gate to leave after.