To me, the single action is like the manual transmission of the firearms world.
People who say:
"I want to be able to just pull the trigger and have it go bang."
sound just like people who say:
"I want to just hit the gas and have the car go, I don't want to mess with shifting gears."
In that line of thinking, Glocks are more of a mass produced fleet vehicle, like a Chevy Impala or Ford Crown Vic. They run great for lots of miles, but if you're really into cars, it's hard to enjoy the driving experience. Their design was catered to uninterrupted function rather than excellent balance and feel.
Maybe others don't see this parallel, but I do. I started modifying cars early with a CJ7, suspension, engine swap, etc. Then later I got into DSMs and started upgrading turbos, injectors, etc and making those faster. I think people who like to tinker are drawn to 1911s like I was.
Even so, it's nice to have a bone-stock reliable vehicle to drive your kids to school or take on a long road trip. I think that's why Glocks make good duty guns, they get the job done even if they aren't as sexy.
To each his own, personally I like tinkering with 1911s and don't mind the added "complexity" to operating them. To me, the "driving experience" makes it all worthwhile.