This is my first time using wireless charging and the convenience can't be overstated.
It's not so much that you don't need to plug a cable in, it's more about the fact that it's charging nearly all the time, which means you're never really worrying about the battery life anymore. Before, you'd set your device down on the table, only bothering with the cable if you knew you needed to charge your batts. Now, you put it on the charger that's on the same table instead so it's always charging regardless. The battery, therefore, is always being "topped off" so to speak. Then, when you return to it or whenever you pick it up next, you're 10, 15, maybe even 20% more charged than before (a good wireless charger can charge surprisingly fast). So the convenience has to do a lot more with the batteries being constantly charged than it is about the cable. To the point where you're never really concerning yourself with the battery life.
Yet still, a wireless charger does eliminate messy USB cables. People are quick to point out the wireless charger has a cable too, but forget that it's always tucked away behind the charging pad. It's never "loose" so to speak. You're never tugging for it or fumbling for the end of the cable. That makes quite a big difference and renders the concern about the charging pad having its own cable pretty moot. There's simply this one designated place to charge your device. Plunk it down and you're good.
I have my charger on my desk and at night when I'm done using my phone, I just reach over and place it down. There's no need to find the cable in the dark and try to get it into the USB slot. It's really nice.
I also own an iPhone 5C, and I really wish it had wireless charging. Dealing with the cables is not difficult, of course, but there's no denying it's more cumbersome than a good wireless charger. I recommend this one, by the way. It's excellent and makes for a beautiful night stand. Charges quickly, and doesn't cause the Nexus 5 to heat up. Well worth the price of admission.
http://www.rei.com/product/864187/tylt-tylt-vu-qi-wireless-charger
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