Wireless charging isn't a "deal breaker" for me either. I mean, "deal breaker" is a strong word to use. I wouldn't not get a phone I wanted just because it didn't have wireless charging.
But at the same time, just because it isn't a deal breaker doesn't mean it shouldn't be a desirable feature. It's an absolutely lovely, useful, convenient, simple and effective feature to use and have.
You have to plug it into the wall once, and then it's just there. You're maximizing the idle time of your phone. Instead of sitting on a table top, it's sitting on the charging pad (or stand, in my case) and is constantly being topped off. From my own uses, it's not so much about not having to deal with plugging in a cable -- which is actually pretty nice in itself actually -- it's more about just keeping the device charged. I almost never worry about battery life anymore. And on certain days, I leave work with 100% battery life.
Can I accomplish this with a plug, too? Of course. That's why wireless charging isn't a "deal breaker" per se, but it sure is damn lovely. Avoiding having to deal with cables is the definition of convenient. Heck, even Apple lauds cable-less features on their iMacs. Be clutter free, they say.
And if we're on the topic of battery features... There's also quick charging, and two power saving modes. None of these are deal breakers either, but they're still nice to have. For those few times you desperately need to keep your phone going, it's very nice indeed to have those features to fall back on.