I have a jack. I do use it on occasion. But man some of you really, really hate Bluetooth.
It's not THAT bad. Maybe your phones just have a really shitty transmitter/receiver? Sure, it's not as good as it can get with a jack.
But I also don't want to have wires hanging while running or biking. Being able to change volume and songs without picking up my phone from pocket is also very convenient.
I still want a jack in my phone. But I really don't get the extreme hate on Bluetooth. It's not 2005 anymore. Bluetooth technology has progressed.