As a teenager, I produced enough to seep through my shorts and make a wet spot on my pants when I got very aroused (which happens just about all the time for teenagers).
In my twenties, I produced several drops when aroused. I could self-suck (and still can). When loosening up my muscles for a self-suck session, I'd tease myself by swirling my tongue around the head, which would result in more than the usual amount of precum. I found the stuff to be absolutely delicious.
In my early thirties, I had a sexual relationship with a woman who I thought was tremendously hot, so during foreplay I had about as much as I did in my teens. Well, this chick really liked precum, and she liked to lick it off my dick. Sometimes she'd squeeze a few drops out of me and then slurp it up. Her attention to my precum turned me on even more, which caused me to produce more precum, which she lapped up, which turned me on more --- chain reaction!
Since my early forties, it's always been just a few drops when I'm very excited, even when I'm self sucking. Some guys in this thread have complained about the hassles involved with large amounts, but if I were so lucky as to produce huge amounts of the yummy stuff, I'd be willing to do whatever it takes to deal with the inconvenience.