Most won't have a problem with it. There are a few that are a bit stricter with their rules.
Any Fixed Price TS will not allow you to share (obviously). This includes Buffets, Family Styles, Shows, etc.
Any items that are marked as "for 2" must use two credits (one from each person) to "buy". The examples here would be the platters at Hacienda de San Angel.
Via Napoli will not allow DDP users to share meals either. Each DDP user must get their own entree here.
Off the top of my head, that's all I can think of. I know there used to be some issues with Beaches and Cream not allowing sharing on DDP, not sure if that's still the case or if they've changed.