I used to be very paranoid about salmonella as well. When I'm done holding my lizards, or between holding different lizards/after handling their equipment and whatever, I always use hand sanitiser.... more of a compulsive habit I've formed over the last 9 years since I started dealing with reptiles, but really, Salmonella doesn't even cross my mind when it comes to the lizards, I'm more worried about it when I don't cook my chickens' eggs all the way through(which I rarely do since dry yolk is bleh, but I digress...)
It really does come down to your hygeine/sanitation practices, and you really have to somehow eat their poo to get salmonella from the dragons. My dragons are generally very clean. They usually poo in the tub and after wards I rinse them off and give them a quick scrub down and rinse with baby soap on their bodies, then they are clean and good to go! If they go potty in their cages, I clean it up ASAP and spray the area with vinegar to clean it.(That's also what I spray the tub with after they poo in it. It's my favourite cleaning product!)
But I've had my Scout for 4.5 years and only once I was really scared I might get salmonella because he had pooed in his cage and there was liquid on one of his furniture pieces and I couldn't tell if it was really soiled or not, so I went to smell it and got it on my lip because I'm a clutz. Ooops! But I was fine. My anxiety made me feel ill all the rest of that day and the next day, but I was fine haha.
I always eat with my dragons, share food with them, let them run on my bed, kiss their bears, put their faces and chest on my face as I snuggle their beard, let them crawl all over my laptop and desk and on the kitchen and dining room counter.... They(The dragons) are always clean though and no one's ever gotten sick =) Now if they were running around in their own feces all day, I would NOT kiss or hug them or let them run around the tables. They would go straight to the tub for a scrubbin'. I think everyone warns people because of the .00002% chance you can get it from them, but I think that uncooked chicken or eggs are a greater risk since you're actually consuming it. Only people with reallllly bad lizard hygeine would probably stand a chance of getting salmonella.