(1) shortened queues
(2) lounge access
(3) and mileage multiplier (altho seems to have mostly disappeared)
complimentary upgrade would be useful if i was flying in US. doesnt exist here.
luggage... i never exceed whats given by way of ticket anyways so doesnt matter.
nothing else really matters. on hotels occasionally get a larger room and some snacks but by and large hotel benefits are especially useless.