So where is the best place to sit....give up the secret...just whisper so everyone else going in August doesn't hear you

! We will end up with a big DIS reunion at the Noodle place in Tomorrowland all running for the same area
In truth, the Noodle Station just is NOT one of the
better places to see Wishes, anyway.
The fact that the sound is far in the distance ands more difficult to understand, and they don't turn off the lights there is reason enough not to try it.
Same goes for the Main Street RR station (which IS a
great place to see the
"SpectroMagic" Parade). They leave the lights on there and on Main Street at that far end to aid guests who are exiting during the fireworks.
If all you want to see is FIREWORKS, you can stand at MOST areas in the MK.
(And a wide variety of places OUTSIDE the MK.)
But if you are NOT at CERTAIN SPECIFIC LOCATIONS, you will MISS the "full impact" of the SHOW called "Wishes".
Wishes has two fireworks "STAGES":
One fires its missiles from a location FAR BEHIND any public area of MK.
The other fires its missiles from the ROOF-TOPS of Fantasyland/Liberty Square/the Castle.
The guests' VIEWING ANGLE will affect "if and how" these two stages can be viewed together (they are designed to be viewed "together".)
There is a full AUDIO TRACK that is synchronized with the fireworks.
It is the "motivation" for the unique fireworks effects that change with each MOOD and SECTION of the audio track.
The audio, and positioning of the two fireworks "stages" relative to the viewer will affect the impact of the show.
The front of the CASTLE ITSELF is part of the "show".
There is an elaborate lighting system that is used to change the color of the castle to suit each MOOD, and even "textures" and shapes are projected on the castle at key points in the show (Mickey's Sorcerer's HAT is a great one).
Tinkerbell's flight (which used to take place PRIOR to the old fireworks show at MK) is now WITHIN "Wishes". She doesn't fly EVERY night, but she OFTEN flies and you should be in a position to see her.
The SWEET-SPOT for Wishes is: starting from approx. the "bridge to Tomorrowland" ...on up Main Street to the "Main Street Cinema" (Pal Mickey Store).
That is simply the "optimum viewing" area.
There are MANY other places to watch, but they are all compromises that diminish the "full effect" of the show in one way or more:
Some have little or no SOUND.
Some have obstructed views of the fireworks.
Some only allow viewing of one of the two fireworks "stages".
Some don't allow a view of the castle-front and/or Tinkerbell when she flies.
So, if you don't MIND this, you can choose from a multitude of "viewing spots" throughout the MK.
Many view it from near the dock for the paddle-wheel Steam Ship in Liberty Square.
Some watch from the bridge that links the main Frontierland street to Splash Mountain.
Some find spots to sit in other areas of Liberty Square and Frontierland.
All of these areas offer a good view of many/most of the effects, but not all... and certainly not in the "foreground-background/dual-layer" manner in which the show is created.
Many view it from near the dock for the paddle-wheel Steam Ship in Liberty Square.
Some watch from the bridge that links the main Frontierland street to Splash Mountain.
Some find spots to sit in other areas of Liberty Square and Frontierland.
All of these areas offer a good view of many/most of the effects, but not all... and certainly not in the "foreground-background/dual-layer" manner in which the show is created.
I will tell you where NOT to view it.
No matter how TEMPTING it may appear before the show:
Do NOT stand on the sidewalk between the Hub and Frontierland,
or on the sidewalk between the Hub and Adventureland.
Trees nearly totally obscure the main larger fireworks, and the audio is (most-likely INTENTIONALLY) MISSING (no speakers) in these areas.
My point is that the show is designed for "FULL EFFECT" to be seen from the "Sweet spot" areas I described. (But, yes, those can be C-R-O-W-D-E-D!)
Wishes is the only fireworks show that can be (for the most part) seen from outside the presenting park.
Good viewing can be found at the beach of the Polynesian Resort (walk along the sidewalk there until you see an view of the castle unobstructed by trees.)
The Ohana restaurant at the Poly offers good views (and they pipe in the audio of the show). Same goes for the California Grill Restaurant (and outdoor terrace) at the Contemporary Resort.
At Grand Floridian, Narcoossee's is the restaurant with the MK and Wishes views (and sound).
The MK parking lot (TTC) offers views as well as other outdoor spots for several miles in any direction of MK. But without the sound, you miss a lot of the "show".