Losing 1K next year... I'll miss the food and drink most.
I know the food options can be subpar, but the food and drink perks are the thing I'll miss most about 1K. The recent change to pre-boarding is second on my list. The last thing I'll miss is the occasional upgrade to first/business. Upgrades are rare (and very nice when you get them), but food and drink are on just about every flight. When I'm in a rush it's nice to know that I won't go hungry if I don't grab something at the airport.
Now I need to figure out how to best to spend all these miles I've accumulated over the last two years. I'm thinking somewhere warm in January.