Since I was a child until this very day anyone who knows me hears "Oh, its smells like Disney!!" come out of my mouth at least once a week!! In the REAL world those smells are usually a full restaurant of freshly baking meals/desserts or freshly bleached floors (reminds me of the pools and clean hotel rooms).
At the parks PP did a pretty excellent job, those water and smokey/musky smells. My favorites come from:
Thunder Mountain
Splash Mountain
Spaceship Earth
Pirates of the Caribbean
Walking through Adventureland; the smells of water, Dole Whip, suntan lotion, plants
and my favorite is the fresh smells walking into Epcot, especially through Future World as the fountain spray whacks your face in the breeze...you can tell I like water smells!