So far wireless charging is just a gimmick. If I use wired charging I can hold my phone and use it, with so called wireless charging, the phone has to sit on a charging pad, making it awkward to use, so not really a clever thing so far. Water proofing is certainly something to boast about, though it took me almost 30 minutes to kill an iPhone 5s in hot soapy water. SD expansion is something I have never missed, to be honest I wish Apple would get their way to get rid of SIM cards as well, fewer moving parts mean fewer problems.
No. It's far from a gimmick. Maybe not useful to you - but I find it extremely useful.