We've been playing around with Instadapp/Makerscan lately and it really works like a charm.
They are sleek interfaces on top of a smart contract that interact with the MakerDAO protocol in an intuitive and friction-less way, making it super simple to open a CDP, top it up, get some DAI out and repay it back (e.g. no need to hold MKR to pay for the stability fee, your ETH gets internally swapped for MKR via Kyber), or even to contribute to someone else's CDP with ETH or paying back DAI (an emerging use case that is worth keeping an eye on eg team Instadapp has been funding itself via this CDP
). The ultimate vision is to build a "decentralized bank" on top of the protocol, with the whole suite of lending, leverage, margin and saving products.
So far the organic demand for something like this seems to be purely speculative (eg recursive leverage) or simply exploratory, but as the ecosystem evolves and UX improves, it will be interesting to see other use cases materialize.
More generally, it's really exciting to enter 2019 with the emergence of consumer-grade applications like Veil, Cent, Makerscan and several others (many more to come) making this whole space a lot less intimidating to the mass market.