Well, I thought this was interesting as I just found out. Now, i'm using this much more frequently whether in pvp, duels, or just grinding. As this works mostly for rogues and shadowmelders >night elves< I'm not sure if a druid can eat in their forms.
It comes in handy when you can eat in stealth, saved me a lot of times from world pvp. Well for rogues, just eat and then stealth, funny how i never even thought of it once. Saved me in quite a lot of situations when i'm pvping and vanish sprint, run behind a tree or something, eat and then stealth. Also in grinding, you just finished a fight and low on health with patrols, no pots and wana waste no downtime. Simply eat and stealth.
This isn't really an explot, but i have nowhere to put it, there should be a tips/trick section, tell me if there is one