I have had wireless headphones for quite some time, before the whole kill-the-jack theme started and wireless connectivity definitely is a must-have for me.
Although, I still like plugging the headphones in when watching a movie or playing a game because the ones that I currently have, have pretty big latency.
But headphones aren't really the thing that annoys me the most about losing the jack. It's situations like one that I went through in the previous weeks: at school each class is preparing an ameture theatre play, it's a school tradition. I was responsible for audio. So I had an app on my phone and... That's all I needed! So simple, I already have my phone with me everyday, I don't have to care about carrying a Bluetooth speaker nor any kind of dongle.
I love Bluetooth and wireless tech but it's that simplicity that we're losing and especially in cases where the jack would easily fit in the phone, I'm very mad it isn't there.