I know you're short on time, but it's probably worth it to give
HydroGuy's A DLR Guide for WDW Vets a quick look.
Are you going to get park hoppers? The parks in DLR are much closer together (think like Epcot's FW and WS; they're about 110 yards apart), so it doesn't necessarily take that long to hop between the parks (it depends on how long the lines are at the ticket gates).
Personally, I would focus on the things that are "unique" (or at least markedly different) to DLR. It also depends on what kinds of attractions and activities you like. It's not "unique" to DL anymore, but SW:GE is open so you can check out the DL version. I would also go see Carsland (and ride RSR). DL's version of F! is better than DHS' (other than DHS has better seating) and WoC is unique to DCA.
In terms of food, DLR doesn't have as many "Signature"-level dining experiences, but their CS is pretty good. For TS locations, I like Cafe Orleans (Pomme Frites!) and Carnation Cafe (Fried Pickles). For CS locations, I like Plaza Inn (Fried Chicken), French Market (Beignets), and Jolly Holiday (everything!).