Party For the Senses does not include a special viewing area (there are just waaaay too many tickets sold for that).
The Exquisite Evenings have in the past included a special viewing area for Illuminations, but I've never taken them up on that perk and haven't paid attention to whether or not it's still included with the event.
ETA: I forgot to mention that at Party For the Senses, as Illuminations time nears, there's a pre-recorded announcement that warns you that Illuminations will be starting soon and they invite you to go outside and watch it (but not from a reserved area).