I also used bleach for many years with no problems, but thought I'd give Star San a try to see if it worked any better. And I haven't looked back.
It's so much easier to use. You don't have to soak anything to sanitize --just get it wet, and after 30 seconds you're good to go. Use a spray bottle to spray things down, or dunk them in the Star San, or put just a little in a bucket or carboy and swirl it around. No rinsing, no need to let it dry. No worries if you splash some on your clothes (maybe I'm just clumsy, but I was always getting bleach spots on things).
No need to mix up a fresh solution each time. I mix up 2.5 gallons at a time with distilled water, put some in a spray bottle, and store the rest in plastic jugs. A little goes a long way, and even though I'm rather profligate in my use of it, and always spill some (did I mention I'm clumsy
), it lasts me awhile before I have to mix up more.