For me it wasn't the perfume, it was the scratches on my back.
You're not busted unless they smell you (the deer, that is), if you're moving slowly and quietly. If they don't "make" you as human, they may calm down or even come to you to see what's up. I once jumped a young 6 pt. and just sat right down where I was. In a few minutes he came sneaking back, trying to figure out what I was. Smarter ones will circle to get your scent, and then you ARE busted.
Snorting can mean several things. I've seen relaxed deer within minutes of being snorted at by other deer, and I've seen deer ignore other deer snorting in the area.
I've noticed that my local deer will snort at me the first few times they smell me in the woods, but later they just melt away quietly. I think the key is whether and how much they have been disturbed.