One smell that Disney has all over there parks is the smell of flowers Disney's Horticulture teams all over the world plant countless numbers of flowers all over the parks and provide wonderful smells in every park all over the world. There are two wonderful smelling areas in EPCOT that come to mind one is on purpose and the other maybe, but i doubt there that smart. The first is out side the park its in the turn around area for the parking shuttles and its a bed with a few crape myrtle trees and in the summer and spring is full of lavender plants. I ask my self did they put all of these strong fragrant flowers there to cover up the smell of the exhaust from the shuttles. If so Imagineers are all the geniuses that we all believe them to be. The other and I know this is on purpose is the garden in France next to the Plume Et Palette to show where alot of the scents come from in most perfumes.
Moving from the out side to inside attractions also boast smells that are memorable and some all of us would like to forget. For the smells we would all like to for get in Journey into Imagination the skunk smell and in Stitches Great Escape the smell of the burped up chili cheese dog. These are examples of smells we would like to forget but its good themeing because we will never forget the bad smells. Examples of good smells are the smell of orange blossoms in Soar'n Over California. Another of the good smells is the water, yes the water for most "Disney Geeks" the smell of the water brings theme right back to Disney World. For me living in Georgia where Florida's water comes from you get that smell all the time.
Finally, but certainly not least is the smell of food, why do you think Disney places food carts all over the parks to entice gusts to eat. Food can be smelled all over the parks with resaturates and food carts all over the parks fill the parks with the wonderful smell of food.
In each of the lands the foods are specific to that area and the smells add to the already deep story and environment already created. Smells are an important bit of the magic that Disney stirs into the soup that are their theme parks. They help create memories for us that will last longer than anything we see or hear.

