No I never do. But I've seen some horrible pictures of some unfortunate fish-keeper's hands when they have contracted bacterial infections from the bacteria in the tank water including salmonella.
It is advisable to wear gloves if you have a cut or wound on your skin, or avoid the tank water until it heals, especially if your immune system isn't the best.
Here's a link to an article on this site which explains the dangers
Only when working with my saltwater tank, but that's mainly because of the bristle/fire worms. I got one stuck to a finger ONCE and that was all it took. In my freshwater tanks, I don't see the need to.
The only time I put on gloves is when I think I might have something on my hands that don't need to get into my tank. Oh yes I always wash my hands in hot water before I play with my tanks and I wash them again with soap and water when I am done. But if I have been doing something like working on my Harley and have gotten oil on my hands that plain hot water will not wash off I put on gloves to protect my fish from me not me from the fish.
Never. I wash my hands before and especially after working on tanks. I'm usually doing a water change anyways, so I wash many times during too. I scrap myself often, but getting better at this. I've even bleed in my tank and worried more about the fish. LOL With anything, wash with soap and water and germs will be fine. (I have a very strong immune system) I did wear medical gloves once when my tank had ich, just in case.
Never, just wash my hands, and arms if I am going to go deeper in the tank with warm water and a little drop of soap... I rinse really well, and wash my hand and arms after wards. I have a good immune system so don't worry much.
I never wear gloves either, although I do have these on hand just in case I ever have a bad cut. I don't use them because I can't feel anything and whatever they are made from, doesn't smell very nice.