Effortlessness. Plugging in is a two-handed operation in most cases, but inductive wireless charging requires just dropping the phone on the mat and picking it up when you're going elsewhere. Both take one hand only, and as I take my phone out of my pocket and put it on the table anyway when sitting down in front of my computer, I might just as well drop it on the pad and have a topped-up phone to grab without any additional unplugging acrobatics when I'm going somewhere else. Tidiness is another thing. I'm actually considering getting a new nightstand from IKEA with an integrated wireless charger. That way I could use my currently secondary phone (S7 Edge) as an alarm clock with no wires in sight and still have it fully charged in the morning. I also have a Qi charger in the car, and being able to tuck the cable powering it neatly away or route it behind the dash is an improvement compared to when I charge my iPhone in my car with the Lightning cord hanging there in the way and getting tangled around the gear stick.
If Apple had some truly revolutionary wireless charging method, I'd be OK with it being proprietary and get some new chargers. However, if it's just yet another inductive charging method, meh. Qi or GTFO when inductive is concerned.