I never thought about my getting a disease from the tank, although after reading the article I can certainly see that it's possible, but rare. But my main reason for wearing gloves is so that I don't get hand creams and moisturizer residue into the tank. Not that I slather them on every minute, but I just wanted to ensure that I wasn't dirtying the water somehow by sticking my bare hands/arms in there.
Snapcrackler, my betta is such a little sweetie; he has such a personality. He is very smart too, to eat off a spoon and follow my finger to the food if he misses it. He's my first betta, so I picked pretty good for my first one! The other betta, my second one, died about a month ago, and he wasn't quite as friendly as my first one, and he didn't follow my finger as well. But I still miss him. Oh, and also, I use the spoon to feed when I have fingernail polish on. The bettas saw the red polish and flared -- not good when you're trying to feed them little pellets between your fingers!