Basin at DTD can be smelled from the outside darn near across the way to the Spitting Stitch opening of the World of
Disney store. Be careful there and on the upper level of the GF where there is another Basin store.
For me, I am highly allergic to mold, but have never had any problems with it at WDW, even on the older dark water rides, like PotC or IaSW. The resorts, Value, Moderate, and Deluxe have all been mold free rooms when we have stayed there.
I agree with avoiding the Perfume shops around the WS. France and Italy are the worst for me. I enjoy the Burberry store in the UK pavillion. Actually, I love the Burberry London scent so much, my partner wears it to remind me of Epcot. (sad, but true)
As long as I take my Singulair, Zytrec, and Advair everyday, I am usually ok. I always carry an Albuterol or Xopenex MDI with me at the parks. I also believe in redundancy, so not only is there one in my cargo shorts pocket, but there is one in my backpack and my partner carries her inhaler too with a spare in her bag as a back up too.
Depending on your triggers, you could go with no problems, or you could be miserable. As long as I avoid citrus type smells, I am usually ok.
Happy planning!

Maggie