Let me try it a slightly different way.
Can you see Wishes outside MK?
Yes.
Except for a few castle projection-effects (and sometimes Tinkerbell) the "entire show" is FIREWORKS and most are launched high enough to see very well across the lake.
Can you see a few of the higher-launched fireworks FROM IllumiNations?
Yes.
BUT, IllumiNations is only "partially" a fireworks presenation, and many of the exposions and sparkle effects are very LOW to the water (some ON the water).
Much more of the show is seen in the water fountains, lasers, lighting effects ON the buildings around the lagoon, the "inferno barge" and the "Video Globe."
So little of the show is "high in the air" that its almost meaningless to see just those effects.
So, can you see ILLUMINATIONS (the "show") outside Epcot?
Nope.
And the same goes DOUBLE at the Studios for Fantasmic!